| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] it [is] [adv] [v-ing] | 175 |
|
| 2 | [vb -s] [pron] [is] [adv] [v-ing] | 111 |
|
| 3 | [vb -s] it [is] [adv] [verb] | 93 |
|
| 4 | [vb -s] it [be] [adv] [v-ing] | 61 |
|
