| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | an [noun sg] on [noun] | 1084 |
|
| 2 | keep an [noun sg] on | 476 |
|
| 3 | keep [noun sg] on [noun] | 13 |
|
| 4 | keep an [noun sg] [noun] | 12 |
|
