| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | keep a watchful eye on | 26 |
|
| 2 | keeping a watchful eye on | 9 |
|
| 3 | [v-ing] a watchful eye on | 9 |
|
| 4 | [vb past] a watchful eye on | 5 |
|
| 5 | to keep a watchful eye on | 5 |
|
| 6 | [to-vb] a watchful eye on | 5 |
|
| 7 | kept a watchful eye on | 5 |
|
