Where to timetable the input session on ‘Correction and Dealing with Student Errors’ is a tricky one and often reflects the trainer’s beliefs about teacher training and teaching.
Some trainers leave it till Week 3, preferring to focus on lesson structures where the target language is presented and then practice of that target language is given.
This could be based on the belief that language lessons should take on an input-output structure where teachers aim to teach a particular pre-decided lexico-grammatical item.
Or this could be based on the belief that teacher trainees on a CELTA are not ready to handle the clarification and correction of language that emerges from student output as they are new to the profession, and are better off having the chance to research and prepare to present a language item.
Of course, there is also the fact that the CELTA criteria expects trainees to articulate the aims of the lesson (e.g. By the end of the lesson, students will have been introduced to and given practice of the use of the present perfect for life experiences in the context of talking about countries they have been to) and show through the stages and procedure of their lesson plan how they are going to go about achieving that aim.
This naturally suggests that the other CELTA criteria regarding the ability to clarify meaning, form and pronunciation of language in Teaching Practice refers mainly to the clarification of the target language stated in the lesson aims.
Hence, in order to best equip teachers to deal with Teaching Practice, the first two weeks of input are often spent understanding the input-output lesson shapes like Present-Practice-Produce and ‘Language from a Text’, and demonstrating how to systematically clarify MFP in such lessons.
Being a Dogmetician, and a believer in the importance dealing with emergent language, I decided to deliver my input session on correction on Day 6 (Week 2, Day 1). After all, if it’s going to be difficult for trainees, they might as well start getting practice of it as soon as possible.

Let us first start by looking at some sentences spoken by my students.
Decide where the mistake lies, whether it is a problem with lexis, grammar, pronunciation or usage, and why you think this mistake was made.
How would you correct the mistake?
Here are some examples:
1) She want some tea.
2) He saw a dream about winning the Olympics yesterday.
3) I am not agree with you.
4) I lied down on my bed when I got home.
5) He seed a film at the cinema last week.
6) I read a new about Team GB’s gold medals this morning.
7) If I am you, I will go home.
8) Last month, I had seen this film.
(1) is a grammatical issue where the student has dropped the third person ‘s’ in ‘wants’. A seemingly simple grammar rule to remember, new teachers are often surprised to find fairly advanced students of English still making this mistake. This is often not because the student is unaware of the rule, but simply forgot. If repeated often, the mistake becomes habitual (or in some literature, ‘fossilized’).
Not surprisingly, the third person ‘s’ is a late acquisition item even among children who speak English as a first language. This could be due to the similarity in the pronunciation of ‘want’ and ‘wants’, and the fact that there is hardly any impact on meaning if the ‘s’ is dropped.
Although (2) is a mistake with lexis and collocation, while (3) is a grammatical mistake, they both are a result of L1 interference, i.e. translation from the student’s first language has caused the mistake. The speaker of sentence (2) is Japanese and the collocation ‘to see a dream’, instead of ‘to have a dream’ is the norm in the Japanese language. Sentence (3) is a mistakes typically made by Spanish, Italian, Portuguese and French speakers, as ‘agree’ is an adjective, as in ‘Estoy de acuerdo’, ‘Sono d’accordo’ or ‘Je suis d’accord’.
Number (4) and (5) feature the same grammatical mistake of using the regular verb past tense ending ‘-ed’ with an irregular verb.
However, the student who said (4) simply did not know the past simple of the irregular verb ‘lie’ and might have confused it with the regular verb ‘to lie’ (as in ‘not to tell the truth’).
The elementary student who said sentence (5) had been able to say ‘I saw’ previously. But when taught the rules for forming the past simple of regular verbs, the eager student over-applied the rules to the irregular verbs as well. As first glance, it might seem like the student has deteriorated. In actual fact, he/she was experimenting with a rule that was taught.
And without experimentation, there can be no language learning.
Sentence (6) also features an over-application of a rule. The student understood that plural nouns often take an ‘s’ in English, e.g. one medal, two medals. The student also knew the word ‘news’ and has assumed that it was a noun in the plural form. He then deduced that one piece of news must be ‘a new’. Very clever!
Sentence number (7) sees the first conditional, instead of the second conditional being used. This could be due to several possible reasons : (a) the student hasn’t had enough practice of the structure and isn’t ready to produce it, (b) the student forgot (c) the student has never come across this structure or hasn’t been taught it (d) the student was taught this in class but misunderstood the teacher and thought that ‘If I were you’ referred to a past time.
Sentence (8) is another example of a student experimenting with the tenses they have learnt and perhaps going a little overboard with it, and overcomplicating the sentence. The past simple would have sufficed.

To sum up, here’s why students make mistakes
- They forgot.
- It’s a habit.
- L1 interference
- Lack of knowledge
- Lack of confidence
- Lack of practice
- Not ready to produce it
- Misunderstanding the teacher
- Over-application of a rule
- Experimentation
But students want to have their mistakes pointed out and corrected. Many of them feel that this is what they are paying the teacher to do.
A director of studies once told me that the most common student complaint they got was that their teachers were not correcting them enough.

But can we correct every mistake we hear?
That would not only disrupt fluency to the point where real communication would be made nearly impossible, but would also affect the student’s confidence.
Instead, deal with issues that are
- Affecting meaning and interfering with communication;
- Recurring mistakes;
- Mistakes made by several members of the class;
- Mistakes made concerning the target language that you focused on in this lesson or in previous lessons.

What are some different ways we can correct a mistake in class?
On-the-spot
(1) Reformulation/Recasting
Student: “I go to the cinema yesterday.”
Teacher: “Oh? You went to the cinema yesterday?”
This involves the teacher simply repeating the student’s sentence back in the correct form. In some arenas, a distinction is drawn between ‘reformulation’ and ‘recasting’, with a suggestion that ‘reformulation’ is when this is done as in a delayed language feedback slot.
However, I find such terminology unhelpful to my trainees and choose to use the term ‘reformulation’ both for on-the-spot and delayed correction.
(2) Elicit by indicating there’s been an error
Student: “I go to the cinema yesterday.”
Teacher: “I go?” (with raised eyebrows and rising intonation)
This works with students who already have been exposed to the language point but have simply either forgotten or have made the mistake a habit.
If students are unable to self-correct, elicit from the other students in the class.
(3) Explicitly tell students what the mistake is
Student: “I go to the cinema yesterday.”
Teacher: “ Yesterday is the past but ‘go’ is the present tense. What’s the past tense of ‘go’?”
or even more explicitly,
Teacher: “Yesterday is the past but ‘go’ is the present tense. So we should say ‘I went to the cinema yesterday.”
Other ways of correcting include using
- finger highlighting,
- identifying the type of error e.g. ‘tense?’ or ‘preposition?’
- gestures to indicate word order,
- using the board and writing up the phonemic script,
- clapping out the stress pattern of a word or sentence, etc.

Delayed Language Feedback (Delayed Correction)
After an activity is over and feedback on content has been conducted, language feedback can be conducted.
In one-to-one lessons, it could be helpful to have a sheet of paper divided into two section – ‘What you said’ and ‘What you could have said’. During the spoken interaction, I write on this sheet frantically. In delayed language feedback, I cover the side that says ‘What you could have said’ and get the student to self-correct. I then gradually reveal my reformulations.
In a class, I would write the sentences containing student errors on the board. I would then put students into pairs to correct the sentences. The person who made the error remains anonymous, but every so often, students giggle and admit that the sentence came from them.
After giving students ample time to discuss the sentences, I elicit the self-corrections from them in open class and we learn from the mistakes together.
If you still use OHP projectors, you could write the sentences straight onto the acetate when monitoring, and flash it up on the wall during delayed language feedback. This would save you time writing it up on the board, but this means that you have to pick the sentences you’d like to focus on as you hear them.

Rather than an input-output model, a focus on error correction earlier on emphasizes the fact that learning is not linear, and that some of the best learning takes place when the teacher helps the students to notice the gap in their knowledge and how it could affect communication.
It might not be easy, but just like language learning, the more one practises dealing with language errors and emergent language, the better one is bound to get at it.
After all, why do we encourage our learners to make mistakes, yet feel like we have to protect our teacher trainees from making them?
As James Joyce said, ‘Mistakes are the portals of discovery.’