| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] it [is] [v-ing] [prep] | 550 |
|
| 2 | but it [is] [verb] [prep] | 188 |
|
| 3 | but [pron] [is] [v-ing] [prep] | 131 |
|
| 4 | but it [be] [v-ing] [prep] | 69 |
|
