| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] not understand why | 94 |
|
| 2 | not understand why [noun prp] | 12 |
|
| 3 | [modal v] understand why [noun prp] | 12 |
|
| 4 | [modal v] not understand [noun prp] | 8 |
|
