| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] understand [adv] | 138 |
|
| 2 | [not/n't] understand [adv] [noun] | 68 |
|
| 3 | could [not/n't] understand [noun] | 11 |
|
| 4 | could [not/n't] [adv] [noun] | 6 |
|
