| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could [not/n't] [vb infin] [noun sg] | 34 |
|
| 2 | they could not [vb infin] [noun sg] | 23 |
|
| 3 | they could n't [vb infin] [noun sg] | 11 |
|
