| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] [pron] [is] [v-ing] | 1115 |
|
| 2 | [verb] it [is] [v-ing] | 732 |
|
| 3 | [vb base] it [is] [verb] | 500 |
|
| 4 | [vb base] it [be] [v-ing] | 369 |
|
