| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [v-ing] [prep] | 3169 |
|
| 2 | had be [v-ing] [prep] | 1920 |
|
| 3 | it had be [prep] | 330 |
|
| 4 | it had be [v-ing] | 125 |
|
