No | Pattern | Freq | Relations |
---|---|---|---|
1 | must have [been] [v-ing] [prep] | 81 | |
2 | must have [been] [v-ing] [prep] | 81 | |
3 | [vb mod] have [been] [v-ing] for | 55 | |
4 | [modal v] have [been] [v-ing] for | 55 | |
5 | must have [been] [verb] for | 36 | |
6 | must have [be] [v-ing] for | 18 | |
7 | must have [been] [v-ing] for | 18 | |
8 | must have [been] [v-ing] for | 18 | |
9 | must [verb] [been] [v-ing] for | 18 |