| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could [not/n't] [vb infin] | 1267 |
|
| 2 | could [not/n't] [vb infin] [noun sg] | 440 |
|
| 3 | they could [vb infin] [noun sg] | 152 |
|
