| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] [verb] be [v-ing] [prep] | 14 |
|
| 2 | it [vb mod] have [be] [v-ing] [prep] | 14 |
|
| 3 | it [vb mod] [vb infin] [be] [v-ing] [prep] | 14 |
|
| 4 | it [vb mod] [verb] been [v-ing] [prep] | 14 |
|
| 5 | it [vb mod] [verb] [been] [v-ing] [prep] | 14 |
|
| 6 | it [vb mod] have [be] [v-ing] [prep] | 13 |
|
| 7 | it must [verb] [be] [v-ing] [prep] | 8 |
|
| 8 | it [vb mod] [verb] [be] [v-ing] for | 6 |
|
