| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] go back | 41 |
|
| 2 | could [adv] go back | 41 |
|
| 3 | could [not/n't] go back | 24 |
|
| 4 | could not go back | 24 |
|
| 5 | could n't go back | 21 |
|
| 6 | could [adv] go back | 17 |
|
| 7 | could never go back | 6 |
|
| 8 | could never go back | 6 |
|
