| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | how it [vb mod] to | 12 |
|
| 2 | how it [modal v] to | 12 |
|
| 3 | how it [modal v] to | 12 |
|
| 4 | how it used to | 8 |
|
| 5 | how it used to | 8 |
|
