| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | he must [prep] been | 12 |
|
| 2 | he must [prep] be | 12 |
|
| 3 | he must [prep] [been] | 12 |
|
| 4 | he must [prep] [be] | 12 |
|
| 5 | he must of [be] | 12 |
|
| 6 | he must [prep] [be] | 12 |
|
