| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | if they [vb mod] be [vb pp] | 88 |
|
| 2 | if they can be [vb pp] | 42 |
|
| 3 | if they could be [vb pp] | 32 |
|
| 4 | if they [vb mod] be used | 6 |
|
