| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] keep an eye on | 13 |
|
| 2 | [vb pp] to keep [art] eye on | 13 |
|
| 3 | [vb pp] keep a eye on | 13 |
|
| 4 | [vb pp] keep [art] eye on | 13 |
|
