| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not [vb infin] [adv] | 389 |
|
| 2 | could not [vb infin] [v-ing] | 246 |
|
| 3 | not [vb infin] [v-ing] [adv] | 43 |
|
| 4 | could [vb infin] [v-ing] [adv] | 31 |
|
