No | Pattern | Freq | Relations |
---|---|---|---|
1 | must have been [prep] | 294 | |
2 | must have been [prep] | 294 | |
3 | [modal v] have been about | 18 | |
4 | must have be about | 10 | |
5 | must have [be] about | 10 | |
6 | must have been about | 10 | |
7 | must have [been] about | 10 | |
8 | must [verb] been about | 10 |