| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [pron] [be] [v-ing] | 3835 |
|
| 2 | [verb] it [be] [v-ing] | 1193 |
|
| 3 | [vb past] it [be] [verb] | 629 |
|
