1 He was clever enough to understand everything
at once.
2 Mother didn't let the children play in/on the street.3 She was so frivolous as to go there
alone4 To put it mildly, she wasn't very pretty.
5 I had nobody to ask.
6 The teacher likes the students to record his lectures.
7 I heard him say that he had nothing to apologize for.
8 The delegation is likely to stay in Moscow for several days.
9 He has gone there to check out all the facts.
10 The children were happy to be taken to the circus.
11 He seemed to be displeased with the results of his work
12 It's necessary to decide today if we should or shouldn't invite the Ivanovs.
13 When asked what had made him cheat us, he
failed to (=couldn't) answer
or didn't want to do it.