| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [verb] so for | 6 |
|
| 2 | had [been] [v-ing] so for | 6 |
|
| 3 | had [been] do so for | 5 |
|
| 4 | had [been] doing so for | 5 |
|
