| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] which from time to time | 5 |
|
| 2 | [prep] which from time to time | 5 |
|
| 3 | which [verb] from time to time | 11 |
|
| 4 | which [vb -s] from time to time | 5 |
|
