| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [prep] [noun] | 16681 |
|
| 2 | [modal v] [vb infin] back [prep] | 1420 |
|
| 3 | [vb infin] back [prep] [noun] | 558 |
|
| 4 | [modal v] [vb infin] back [noun] | 52 |
|
