Answer:1. should2. must3. should4. could5. might6. should7. would8. should9. must10. mustCorrect sentences:1. You should finish your homework before going out to play.2. She must be at home; I saw her car parked outside.3. We should go to the beach tomorrow if the weather is nice.4. He could run faster when he was younger.5. They might bring their jackets; it looks like it might rain.6. You should be more careful when crossing the street.7. I would help you with your assignment if you ask nicely.8. You should try the new restaurant; I've heard good things about it.9. She must call her parents to tell them she's running late.10. He must have left his keys at home, that's why he can't get in.Modal verb usage:- Can: ability- Could: past ability or possibility- May: permission or possibility- Might: possibility or uncertainty- Must: necessity or obligation- Should: advice or recommendation- Would: conditional or hypothetical situations