| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] for about a hour | 21 |
|
| 2 | [verb] for about an hour | 21 |
|
| 3 | [vb past] for about a hour | 9 |
|
| 4 | [vb base] for about a hour | 6 |
|
