| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [to-vb] [Wh adv] i | 10 |
|
| 2 | [vb mod] [to-vb] [Wh adv] i | 10 |
|
| 3 | used [to-vb] [Wh adv] i | 8 |
|
| 4 | used [to-vb] [Wh adv] i | 8 |
|
| 5 | [modal v] [to-vb] when i | 7 |
|
