| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [verb] on for hours | 6 |
|
| 2 | [vb mod] [verb] on for hours | 6 |
|
| 3 | [verb] on for [adj] hours | 12 |
|
| 4 | [verb] on for [num] hours | 8 |
|
| 5 | [verb] on for three hours | 5 |
|
| 6 | [verb] on for three hours | 5 |
|
