| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] in [pron] | 490 |
|
| 2 | it must [be] [pron] | 118 |
|
| 3 | it must [be] in | 32 |
|
| 4 | must [be] in [pron] | 18 |
|
