| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] any length of time | 101 |
|
| 2 | [prep] any length of time | 101 |
|
| 3 | [prep] any length [prep] time | 101 |
|
| 4 | for any length [prep] time | 96 |
|
