| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | used [to-vb] at [noun sg] | 22 |
|
| 2 | used [verb] at [noun sg] | 22 |
|
| 3 | used [verb] at [noun sg] | 22 |
|
| 4 | used [verb] at school | 8 |
|
