| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they [vb mod] [verb] [v-ing] | 267 |
|
| 2 | [pron] [vb mod] keep [v-ing] | 139 |
|
| 3 | they [modal v] keep [v-ing] | 19 |
|
| 4 | they [vb mod] keep [verb] | 19 |
|
