| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it could [vb infin] [be] | 516 |
|
| 2 | it could [vb infin] [prep] | 375 |
|
| 3 | could [vb infin] [prep] [be] | 268 |
|
| 4 | it [vb infin] [prep] [be] | 102 |
|
| 5 | it could [prep] [be] | 10 |
|
