| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [verb] an | 5930 |
|
| 2 | [vb mod] keep [art] | 634 |
|
| 3 | [vb mod] keep [art] | 634 |
|
| 4 | [vb mod] keep a | 255 |
|
| 5 | [modal v] keep an | 95 |
|
