| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not [verb] the | 1845 |
|
| 2 | could not [vb infin] the | 1845 |
|
| 3 | [modal v] not understand the | 78 |
|
| 4 | [vb mod] not understand the | 78 |
|
| 5 | could not understand [art] | 45 |
|
| 6 | could [adv] understand the | 35 |
|
| 7 | could not understand the | 28 |
|
| 8 | could not understand the | 28 |
|
