| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] had been [adv prt] since | 6 |
|
| 2 | had been [verb] [adv prt] since | 15 |
|
| 3 | had been [vb pp] [adv prt] since | 8 |
|
| 4 | had been [v-ing] [adv prt] since | 7 |
|
