| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [prep] [v-ing] | 5741 |
|
| 2 | [be] it [prep] | 1468 |
|
| 3 | it [prep] [v-ing] | 1118 |
|
| 4 | [be] it [v-ing] | 564 |
|
