| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | used [to-vb] at [noun prp] | 22 |
|
| 2 | [vb mod] [to-vb] at [noun prp] | 22 |
|
| 3 | used [to-vb] at [noun prp] | 22 |
|
| 4 | [modal v] to work at [noun prp] | 7 |
|
