| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [adv] [noun] | 3248 |
|
| 2 | it must be [adv] | 279 |
|
| 3 | it must be [noun] | 147 |
|
| 4 | must be [adv] [noun] | 26 |
|
