| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | used [to-vb] [prep] [art] | 668 |
|
| 2 | used [to-vb] [prep] [art] | 668 |
|
| 3 | [modal v] [to-vb] at [art] | 46 |
|
| 4 | used [to-vb] at [art] | 38 |
|
| 5 | used [verb] at [art] | 38 |
|
| 6 | used [to-vb] at [art] | 38 |
|
