| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not know the [noun] to | 35 |
|
| 2 | not [verb] the extent to | 15 |
|
| 3 | not know the extent [prep] | 12 |
|
| 4 | not know the extent [prep] | 12 |
|
| 5 | not know the extent to | 5 |
|
| 6 | not know [art] extent to | 5 |
|
| 7 | [adv] know the extent to | 5 |
|
