| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [v-ing] for | 496 |
|
| 2 | had been [v-ing] [adv prt] | 344 |
|
| 3 | been [v-ing] [adv prt] for | 198 |
|
| 4 | had been [adv prt] for | 28 |
|
