A transformation exercise is an exercise where learners are given one sentence and need to complete a second sentence so that it means the same.

Learner in Egypt doing a language exercise at a desk

The second sentence usually has a prompt.

Example
The following is an example of a transformation question:

Call me immediately he arrives Call me __________ he arrives (soon)

Answer: Call me as soon as he arrives

In the classroom
Transformation exercises involve learners in consciously manipulating language patterns, and can raise their awareness of structure. They are a common test item, where they are used to test discrete items of language, usually structural.

Further links:
https://www.teachingenglish.org.uk/article/test-question-types
https://www.teachingenglish.org.uk/article/planning-a-grammar-lesson

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