| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | to keep a eye [prep] [pos pn] [noun] | 12 |
|
| 2 | to keep an eye [prep] [pos pn] [noun] | 12 |
|
| 3 | to keep a eye on [pos pn] [noun] | 12 |
|
| 4 | to keep a eye on [pos pn] [noun] | 12 |
|
| 5 | to keep a eye [prep] [pos pn] [noun sg] | 9 |
|
