| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [been] [adj] for | 48 |
|
| 2 | [modal v] have [been] responsible for | 39 |
|
| 3 | must have [been] responsible [prep] | 5 |
|
| 4 | must have [be] responsible for | 5 |
|
| 5 | must have [been] responsible [prep] | 5 |
|
| 6 | must have [been] responsible for | 5 |
|
| 7 | must [verb] [been] responsible for | 5 |
|
