| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb infin] [adv] for a | 415 |
|
| 2 | must [vb infin] [adv] a | 60 |
|
| 3 | must [vb infin] [adv] for | 50 |
|
| 4 | must [vb infin] for a | 34 |
|
