| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [modal v] [be] helpful | 24 |
|
| 2 | [Wh det] [vb mod] [be] helpful | 24 |
|
| 3 | [Wh det] [modal v] be helpful | 24 |
|
| 4 | [Wh det] [modal v] be helpful | 24 |
|
| 5 | which [modal v] [be] helpful | 21 |
|
| 6 | [Wh det] may [be] helpful | 7 |
|
| 7 | [Wh det] may [be] helpful | 7 |
|
| 8 | [Wh det] can [be] helpful | 5 |
|
| 9 | [Wh det] can [be] helpful | 5 |
|
| 10 | [Wh det] might [be] helpful | 5 |
|
| 11 | [Wh det] might [be] helpful | 5 |
|
