The use of helping verbs causes certain changes in verb phrases that we need to be able to recognize. One change is the use of contractions (contractions are two or more words combined together with an apostrophe).
As mentioned before, it’s a good idea to memorize the helping verbs. If you haven’t memorized them, take a few minutes to learn them.
Group 1: is, am, are, was, were, be, being, been
Group 2: has, have, had
Group 3: do, does, did
Group 4: shall, will, should, would
Group 5: may, might, must, can, could
Instructions: List the contractions in the following sentences.
1. I’ve done it again.
2. You aren’t going with us.
3. She’s staying to tend the kids.
–For answers scroll down.
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from Daily Grammar Lessons Blog http://dailygrammarlessons.blogspot.com/2016/08/lesson-7-parts-of-speech-verbs.html