| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [v-ing] | 2521 |
|
| 2 | it is [that] | 704 |
|
| 3 | is [v-ing] [that] | 425 |
|
| 4 | it [v-ing] [that] | 17 |
|
