| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had be [verb] for several | 17 |
|
| 2 | had been [verb] for several | 17 |
|
| 3 | had [been] [verb] for several | 17 |
|
| 4 | had [be] [v-ing] for several | 10 |
|
| 5 | had [be] [vb pp] for several | 7 |
|
