| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [vb pp] in the past | 48 |
|
| 2 | had do in the past | 11 |
|
| 3 | had done in the past | 11 |
|
| 4 | had happened in the past | 7 |
|
| 5 | had happen in the past | 7 |
|
