| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] about half a hour | 17 |
|
| 2 | [verb] about [det] an hour | 17 |
|
| 3 | [verb] about [det] a hour | 17 |
|
| 4 | take about [det] a hour | 6 |
|
| 5 | [vb base] about [det] a hour | 5 |
|
| 6 | [vb infin] about [det] a hour | 5 |
|
