| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it [is] [adv] [v-ing] | 534 |
|
| 2 | but it [is] [adv] [verb] | 417 |
|
| 3 | but [pron] [is] [adv] [v-ing] | 278 |
|
| 4 | but it [be] [adv] [v-ing] | 168 |
|
