| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [conj] [vb infin] | 617 |
|
| 2 | not [vb infin] [conj] [vb infin] | 527 |
|
| 3 | could not [vb infin] [conj] | 454 |
|
| 4 | could not [vb infin] [vb infin] | 5 |
|
