1. i can't swim
2. my mom may not come today
3. i can't do my homework, it's too hard
4. You may not play football on the grass after rain
5. she can't read
6. i can't write, my arm hurts
7. i can't find my keys
8. we may not be at home today
9. Customers may not enter this room
10. i can't ride a bike