| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | children could [adv] [vb infin] | 16 |
|
| 2 | children could [not/n't] [verb] | 11 |
|
| 3 | children could not [verb] | 11 |
|
| 4 | children could not [verb] | 7 |
|
| 5 | children could [adv] [verb] | 5 |
|
