| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] to keep an eye on | 13 |
|
| 2 | [vb pp] to keep an eye on | 13 |
|
| 3 | have to keep an eye on | 13 |
|
| 4 | [vb past] to keep an eye on | 10 |
|
| 5 | [vb infin] to keep an eye on | 10 |
|
| 6 | want to keep an eye on | 7 |
|
| 7 | need to keep an eye on | 6 |
|
| 8 | [v-ing] to keep an eye on | 6 |
|
