| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | keep an eye on their [noun] | 8 |
|
| 2 | keep [art] eye on their [noun] | 8 |
|
| 3 | keep a eye on their [noun] | 8 |
|
| 4 | keep [art] eye on their [noun pl] | 6 |
|
