| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [pron] [be] [v-ing] | 172 |
|
| 2 | it [be] [pers pn] [be] [v-ing] | 152 |
|
| 3 | [pron] [be] i [be] [v-ing] | 81 |
|
| 4 | it [be] i [be] [verb] | 21 |
|
| 5 | it [be] i [be] [v-ing] | 18 |
|
