| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] used to | 612 |
|
| 2 | office [vb mod] to | 6 |
|
| 3 | office [modal v] to | 6 |
|
| 4 | office used to | 5 |
|
| 5 | office used [prep] | 5 |
|
