| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [been] [verb] for | 1516 |
|
| 2 | had [been] trying [verb] | 115 |
|
| 3 | [been] trying [verb] for | 16 |
|
| 4 | had [been] trying for | 11 |
|
