| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | how they [vb mod] [to-vb] | 31 |
|
| 2 | how they used [to-vb] | 25 |
|
| 3 | how they used [to-vb] | 25 |
|
| 4 | how they [modal v] to do | 7 |
|
| 5 | how they ought [to-vb] | 6 |
|
| 6 | how they ought [to-vb] | 6 |
|
