| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb past] be [v-ing] [prep] | 45 |
|
| 2 | it [vb past] [been] [v-ing] [prep] | 42 |
|
| 3 | it [vb past] been [v-ing] [prep] | 42 |
|
| 4 | it had [be] [v-ing] [prep] | 41 |
|
| 5 | it [vb past] [be] [v-ing] for | 17 |
|
| 6 | it [vb past] [be] [v-ing] on | 7 |
|
| 7 | it [vb past] [be] [v-ing] in | 5 |
|
| 8 | it [vb past] [be] going [prep] | 5 |
|
| 9 | it [vb past] [be] [v-ing] with | 5 |
|
