| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [vb pp] [num] hours [verb] | 6 |
|
| 2 | had spend [num] hours [verb] | 5 |
|
| 3 | had [verb] [num] hours [v-ing] | 5 |
|
| 4 | had spent [num] hours [verb] | 5 |
|
