| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [v-ing] [prep] | 2325 |
|
| 2 | but it [is] [prep] | 503 |
|
| 3 | but it [is] [v-ing] | 218 |
|
| 4 | but [is] [v-ing] [prep] | 24 |
|
