| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] understand a [noun sg] | 10 |
|
| 2 | could [not/n't] understand [adj] [noun sg] | 8 |
|
| 3 | could [not/n't] understand a [adj] | 6 |
|
| 4 | [not/n't] understand a [adj] [noun sg] | 6 |
|
