| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [conj] it [modal v] [verb] | 190 |
|
| 2 | [is] [conj] it [vb mod] [verb] | 190 |
|
| 3 | [is] [conj] [pron] must [verb] | 53 |
|
| 4 | [be] [conj] it must [verb] | 16 |
|
| 5 | [is] [conj] it must [verb] | 11 |
|
