| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [verb] to | 2093 |
|
| 2 | had been [v-ing] to | 118 |
|
| 3 | [verb] been happening to | 21 |
|
| 4 | have been happening to | 21 |
|
| 5 | had been happening [prep] | 13 |
|
| 6 | had been happening [prep] | 13 |
|
| 7 | had [been] happening to | 5 |
|
| 8 | [vb past] been happening to | 5 |
|
| 9 | had been happening to | 5 |
|
| 10 | had [be] happening to | 5 |
|
| 11 | had been happen to | 5 |
|
| 12 | had be happening to | 5 |
|
