| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] keep an eye [prep] [pron] | 43 |
|
| 2 | could [verb] an eye [prep] [pron] | 10 |
|
| 3 | could keep an [noun sg] [prep] [pron] | 10 |
|
| 4 | could keep a eye [prep] [pron] | 10 |
|
| 5 | could keep an eye [prep] [pron] | 10 |
|
| 6 | could keep [art] eye [prep] [pron] | 10 |
|
| 7 | could keep [art] eye [prep] [pron] | 10 |
|
| 8 | could keep an [noun] [prep] [pron] | 10 |
|
