| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have [adv] [been] | 2100 |
|
| 2 | have [adv] [been] [v-ing] | 1055 |
|
| 3 | it have [been] [v-ing] | 414 |
|
| 4 | it have [adv] [v-ing] | 5 |
|
