| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could n't [vb infin] to | 191 |
|
| 2 | could [vb infin] back to | 89 |
|
| 3 | n't [vb infin] back to | 75 |
|
| 4 | could n't [vb infin] back | 50 |
|
