No | Pattern | Freq | Relations |
---|---|---|---|
1 | must have [been] [prep] [prep] | 12 | |
2 | must have [been] [prep] [prep] | 12 | |
3 | must have [been] [prep] for | 8 | |
4 | [modal v] have [been] [prep] for | 8 | |
5 | must [verb] [been] [prep] for | 8 | |
6 | must have [been] [prep] for | 8 | |
7 | must have [be] [prep] for | 8 |