| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | for [adj] hours [prep] | 341 |
|
| 2 | a [adj] hours [prep] | 209 |
|
| 3 | for a [adj] hours | 158 |
|
| 4 | for a [adj] [prep] | 118 |
|
