| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] had been [v-ing] for [num] | 20 |
|
| 2 | [noun sg] had be [v-ing] for [num] | 10 |
|
| 3 | [noun prp] had be [v-ing] for [num] | 5 |
|
