Răspuns:
1)They couldn't do it because it was impossible.
2)
She probably gave up sooner than she should have.
or
She might've gave in too soon.
3)Her house was too large ,so she couldn't manage it.
4)You should read it twice before you sign.
5)I wanted to mend my watch, so I went to the watchmaker's.
6)She shouldn't have said it aloud.
7)We didn't expect that many guests.
8)Although we've warned them repeatedly, they kept doing it.
9)If he didn't find a taxi in time, he missed the train.
10)You'll have to get decorations.
11)How kind of you to remember my favorite color!
12)You should give up.