| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] what extent [adj] [noun pl] | 16 |
|
| 2 | [prep] what extent [modal v] [adj] | 12 |
|
| 3 | [prep] what extent [modal v] [noun pl] | 9 |
|
| 4 | what extent [modal v] [adj] [noun pl] | 7 |
|
