| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [v-ing] [prep] | 2418 |
|
| 2 | [vb past] be [v-ing] [prep] | 2310 |
|
| 3 | it [vb past] be [prep] | 348 |
|
| 4 | it [vb past] be [v-ing] | 135 |
|
| 5 | it [vb past] [v-ing] [prep] | 95 |
|
