| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] go on for a long | 8 |
|
| 2 | [vb mod] go on for a long | 8 |
|
| 3 | could go on for a long | 5 |
|
| 4 | could go on for a long | 5 |
|
