| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [conj] | 826 |
|
| 2 | it is [adv] [v-ing] | 595 |
|
| 3 | is [adv] [v-ing] [conj] | 268 |
|
| 4 | it is [v-ing] [conj] | 128 |
|
| 5 | it [adv] [v-ing] [conj] | 9 |
|
