| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who [verb] be behind | 8 |
|
| 2 | who [verb] [be] behind | 8 |
|
| 3 | who [verb] [been] behind | 7 |
|
| 4 | who have [be] behind | 7 |
|
| 5 | who [verb] been behind | 7 |
|
