| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not keep [noun sg] [prep] | 41 |
|
| 2 | could keep [noun sg] [prep] | 8 |
|
| 3 | could not keep [noun sg] | 6 |
|
| 4 | could not [noun sg] [prep] | 5 |
|
