| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [v-ing] [adv prt] [prep] | 171 |
|
| 2 | had been [v-ing] [prep] [num] | 83 |
|
| 3 | been [v-ing] [adv prt] [prep] [num] | 35 |
|
| 4 | had been [adv prt] [prep] [num] | 12 |
|
