| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] go back | 692 |
|
| 2 | [vb mod] go back | 692 |
|
| 3 | must go [adv] | 347 |
|
| 4 | must go [adv prt] | 200 |
|
| 5 | must [verb] back | 177 |
|
| 6 | must [vb infin] back | 177 |
|
| 7 | must go back | 61 |
|
| 8 | must go back | 61 |
|
| 9 | must go back | 61 |
|
