| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [v-ing] on | 101 |
|
| 2 | had be going on | 62 |
|
| 3 | had be working on | 16 |
|
| 4 | had be carrying on | 6 |
|
| 5 | had be sitting on | 5 |
|
