| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had gone to [art] trouble | 5 |
|
| 2 | had go to [art] trouble | 5 |
|
| 3 | had [vb pp] to [art] trouble | 5 |
|
| 4 | had [verb] to the trouble | 5 |
|
