| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must have | 5556 |
|
| 2 | they [modal v] have | 5462 |
|
| 3 | they must [verb] | 1627 |
|
| 4 | they must [vb infin] | 1624 |
|
| 5 | they must have | 557 |
|
