| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [pron] must have [been] | 59 |
|
| 2 | [prep] [Wh det] must have [been] | 40 |
|
| 3 | [prep] which [vb mod] have [been] | 26 |
|
| 4 | [prep] which [modal v] have [been] | 26 |
|
| 5 | [prep] which must [verb] [been] | 6 |
|
| 6 | [prep] which must have [been] | 6 |
|
| 7 | [prep] which must have [been] | 6 |
|
| 8 | [prep] which must have [been] | 6 |
|
| 9 | [prep] which must have [been] | 6 |
|
| 10 | [prep] which must have [be] | 6 |
|
| 11 | [prep] which must [vb infin] [been] | 6 |
|
