| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] [vb infin] [subord] | 306 |
|
| 2 | it [modal v] [vb infin] [subord] | 306 |
|
| 3 | [pron] could [vb infin] [subord] | 296 |
|
| 4 | it could [vb infin] [conj] | 75 |
|
| 5 | it could [vb infin] [subord] | 18 |
|
| 6 | it could [verb] [subord] | 18 |
|
