| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must have [vb pp] | 2520 |
|
| 2 | we [modal v] have [vb pp] | 1392 |
|
| 3 | we must [verb] [vb pp] | 78 |
|
| 4 | we must have [verb] | 74 |
|
