Decide whether when or while should be used.
it's relly helpful. thanks!!!
Nice exercise!
practical and clear... thanks a million
Nice idea. Most of them are good but for intermediate or low-intermediate students some language may be confusing as in 2: "might have been canceling" is taught to high intermediate students. I would just simplify some language here. Past Continuous is usually taught to low intermediate EFL students.
Pretty good! Thanks!!
This exercise is very useful. All the same with comments on incorrect answers, it will be better.
Thanks so much, it is very help full.
this question are very good and provoking. I like qoestions. thank you very much
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Thanks...