| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [v-ing] for an [noun sg] | 26 |
|
| 2 | had been [v-ing] an [noun sg] | 24 |
|
| 3 | had been [v-ing] for [noun sg] | 14 |
|
| 4 | had been [v-ing] for an | 12 |
|
