| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [to-vb] for | 1302 |
|
| 2 | [adv] required [to-vb] | 365 |
|
| 3 | [adv] required for | 121 |
|
| 4 | required [to-vb] for | 63 |
|
