| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must have be | 781 |
|
| 2 | it have be [prep] | 614 |
|
| 3 | must have be [prep] | 294 |
|
| 4 | it must be [prep] | 189 |
|
| 5 | it must have [prep] | 8 |
|
