| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb past] [art] | 8566 |
|
| 2 | [vb past] [v-ing] [art] | 2144 |
|
| 3 | it [vb past] [v-ing] | 435 |
|
| 4 | it [v-ing] [art] | 173 |
|
