1 The children had fun last Saturday.
/ The children enjoyed themselves last Saturday.
2 He could never wait,could he ( never 从来不,表示否定）
2 I'm sure that my father will not like it.
3 The medicine is too expensive for poor people to buy .
/ The medicine is so expensive that poor people can't buy it.
4 The book that / which he likes to read is very interesting .