| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] should be kept [prep] | 37 |
|
| 2 | [noun pl] should be keep in | 12 |
|
| 3 | [noun pl] should be keep to | 11 |
|
| 4 | [noun pl] should be keep on | 5 |
|
