| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must be [prep] [to-vb] | 9 |
|
| 2 | it must be like [to-vb] | 9 |
|
| 3 | it must be like [to-vb] | 9 |
|
| 4 | it must be [prep] [to-vb] | 9 |
|
