| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [vb infin] | 32770 |
|
| 2 | could not [vb infin] | 21316 |
|
| 3 | not [adv] [vb infin] | 18379 |
|
| 4 | could not [adv] | 1875 |
|
