Sentence Completion is a TEFL activity which can be used to practice different forms of sentences‏‎. It works well with different verb forms‏‎, conditionals‏‎ and so on.
Preparation
Write out a series of sentences which are examples of the kind of sentence/verb structure you want to practice, and put them onto flashcards‏‎ (so you can use them later with other classes).

For example these are for…