| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] it [is] [adv] [v-ing] | 175 |
|
| 2 | [vb base] [pron] [is] [adv] [v-ing] | 168 |
|
| 3 | [vb base] it [is] [adv] [verb] | 149 |
|
| 4 | [vb base] it [be] [adv] [v-ing] | 73 |
|
