| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what extent [modal v] [noun pl] | 9 |
|
| 2 | what extent [vb mod] [noun pl] | 9 |
|
| 3 | what extent can [noun pl] | 6 |
|
| 4 | what extent can [noun pl] | 6 |
|
