| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] go [adv] | 214 |
|
| 2 | [modal v] [not/n't] go back | 126 |
|
| 3 | could [not/n't] [vb infin] back | 68 |
|
| 4 | could [not/n't] [verb] back | 68 |
|
| 5 | could [adv] go back | 41 |
|
| 6 | could [not/n't] go back | 24 |
|
