| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | used [to-vb] [prep] [noun sg] | 160 |
|
| 2 | used [to-vb] at [noun] | 54 |
|
| 3 | [modal v] [to-vb] at [noun sg] | 26 |
|
| 4 | used [verb] at [noun sg] | 22 |
|
