6.He should. more careful when crossing the street last Friday.(BE). 7.They might not. the medting due to bad to bad weather (ATTEND) 8. He could the wrong train yesterday (CATCH) 9 she shouldn't. too...

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6. He should have been more careful when crossing the street last Friday.

7. They might not have attended the meeting due to bad weather.

8. He could have caught the wrong train yesterday.

9. She shouldn’t have stayed up too late at night when she was young.

10. She didn’t have to study for the exam last week.

11. She might have bought a new dress for the party last year.