Answer:
1. Where did you <u>go</u> yesterday?
2. You <u>don't</u> have to go if you don't want to.
3. We <u>should not</u> run. The train doesn't <u>leave</u> for an hour.
4. You <u>have to be</u> careful. <u>That's</u> very dangerous.
5. How <u>would</u> they get to school every morning?
6. What's he like? Well, he's very quiet and serious.
Explanation: