| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb infin] i [vb infin] | 995 |
|
| 2 | must [vb infin] i | 528 |
|
| 3 | must i [vb infin] | 72 |
|
| 4 | must [vb infin] [vb infin] | 16 |
|
