| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb -s] [been] [v-ing] | 283 |
|
| 2 | [vb -s] [been] [v-ing] on | 191 |
|
| 3 | it [vb -s] [been] on | 12 |
|
| 4 | it [been] [v-ing] on | 5 |
|
