| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] vary from time to time | 11 |
|
| 2 | [vb mod] vary from time to time | 11 |
|
| 3 | [vb mod] vary [prep] time to time | 11 |
|
| 4 | [vb mod] vary [prep] time to time | 11 |
|
| 5 | will vary [prep] time to time | 7 |
|
