| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [prep] [pron] | 2136 |
|
| 2 | it must be [prep] | 189 |
|
| 3 | it must be [pron] | 118 |
|
| 4 | must be [prep] [pron] | 109 |
|
