| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] can [be] [verb] back [prep] | 13 |
|
| 2 | [Wh det] can be [verb] back [prep] | 13 |
|
| 3 | [Wh det] can [be] [vb pp] back [prep] | 13 |
|
| 4 | [Wh det] can [be] [verb] back [prep] | 13 |
|
| 5 | which can [be] [verb] back [prep] | 13 |
|
| 6 | [Wh det] can [be] [verb] back to | 9 |
|
| 7 | [Wh det] can [be] [verb] back to | 9 |
|
| 8 | [Wh det] can [be] trace back [prep] | 8 |
|
| 9 | [Wh det] can [be] traced back [prep] | 8 |
|
