| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] it [is] | 8661 |
|
| 2 | it [is] [v-ing] | 7295 |
|
| 3 | [vb base] it [v-ing] | 230 |
|
| 4 | [vb base] [is] [v-ing] | 169 |
|
