| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | used [to-vb] [prep] | 1934 |
|
| 2 | used [to-vb] [prep] | 1934 |
|
| 3 | [modal v] [to-vb] at | 202 |
|
| 4 | used [to-vb] at | 171 |
|
| 5 | used [verb] at | 171 |
|
