| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should always keep [prep] [noun sg] with | 6 |
|
| 2 | should always keep in [noun sg] [prep] | 6 |
|
| 3 | should always keep [prep] [noun sg] [prep] | 6 |
|
| 4 | should always keep [prep] touch [prep] | 6 |
|
| 5 | should always keep [prep] [noun sg] [prep] | 5 |
|
