| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] be when | 47 |
|
| 2 | [prep] [be] when | 47 |
|
| 3 | [prep] [be] when | 44 |
|
| 4 | [prep] be when | 44 |
|
| 5 | to [be] when | 44 |
|
