| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a close watch on | 31 |
|
| 2 | keep a close watch on | 30 |
|
| 3 | [verb] a close watch on | 28 |
|
| 4 | [v-ing] a close watch on | 11 |
|
| 5 | keeping a close watch on | 10 |
|
| 6 | to keep a close watch on | 7 |
|
| 7 | [to-vb] a close watch on | 7 |
|
| 8 | [vb infin] a close watch on | 5 |
|
| 9 | keep a close watch on | 5 |
|
