| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not [verb] for a | 24 |
|
| 2 | could not [verb] a [adj -er] | 20 |
|
| 3 | not [verb] for a [adj -er] | 14 |
|
| 4 | could [verb] for a [adj -er] | 5 |
|
