| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [verb] | 51063 |
|
| 2 | it [be] [v-ing] | 10696 |
|
| 3 | [pron] [be] raining | 278 |
|
| 4 | [pers pn] [be] raining | 277 |
|
| 5 | it [be] rain | 277 |
|
| 6 | it [be] raining | 275 |
|
