| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could go [adv] [conj] | 122 |
|
| 2 | [modal v] go back [conj] | 72 |
|
| 3 | could [verb] back [conj] | 30 |
|
| 4 | could [vb infin] back [conj] | 30 |
|
| 5 | could go back [conj] | 9 |
|
