| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [to-vb] [prep] | 71804 |
|
| 2 | [vb pp] [to-vb] [prep] | 17262 |
|
| 3 | required [verb] [prep] | 473 |
|
| 4 | require [to-vb] [prep] | 464 |
|
| 5 | required [to-vb] [prep] | 442 |
|
