| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | used [to-vb] [prep] [art] [noun] [conj] | 79 |
|
| 2 | [modal v] [to-vb] [prep] a [noun] [conj] | 17 |
|
| 3 | used [verb] [prep] a [noun] [conj] | 15 |
|
