| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [prep] [v-ing] | 1207 |
|
| 2 | [noun] is [prep] [v-ing] | 890 |
|
| 3 | [noun] it is [prep] | 345 |
|
| 4 | [noun] it is [v-ing] | 218 |
|
| 5 | [noun] it [prep] [v-ing] | 6 |
|
