| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] keep a eye on | 12 |
|
| 2 | [vb past] keep [art] eye on | 12 |
|
| 3 | [vb past] keep an eye on | 12 |
|
| 4 | [vb past] to keep [art] eye on | 10 |
|
