1 去掉it
2 whom前加to或者spoke后加to
3 when-that/which 或者去掉when
4 holidays后加when
5 where-which/that
6 that-who
7 which前加in, 或者which改that, 或者去掉which
8 when-that
9 去掉and,或者which改成it
10 which-that
11. 去掉it
12 want-wanting或者want前加who
13 because-why
14 give-gives
15 that-as
16 have-has
17 which-that, 或者去掉which
18 Which-As
19 which-that
20 who's-whose
21 第二个who-that