| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [v-ing] [prep] be | 927 |
|
| 2 | [vb past] it [be] [v-ing] [prep] | 83 |
|
| 3 | [vb past] [be] [v-ing] [prep] be | 7 |
|
| 4 | [vb past] it [be] [prep] be | 5 |
|
