| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [be] [v-ing] [prep] [det] | 1610 |
|
| 2 | it [be] [verb] [prep] [det] | 668 |
|
| 3 | it [be] [v-ing] [prep] [adj] | 187 |
|
| 4 | it [be] [v-ing] [prep] [det] | 78 |
|
