Let's use each of the given contractions ('He's,' 'What's,' 'Can't,' 'You've,' 'It's,' 'That's,' 'Who's,' 'I'm,' 'We're') in sentences:
He's my best friend, and we have known each other since kindergarten.
What's your favorite book to read during summer break?
I can't believe we finally finished our group project on time!
You've done an excellent job presenting your science fair project.
It's going to rain all weekend, so we should plan indoor activities.
That's the most incredible performance I've ever seen in a school play.
Who's going to join me for lunch in the cafeteria today?
I'm really excited about the upcoming school trip to the museum.
We're planning a surprise party for our teacher's birthday on Friday.
Each of these sentences incorporates a contraction to make the language more conversational and concise. Understanding and using contractions helps in both written and spoken English.