| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it have been [verb] | 6114 |
|
| 2 | [pron] have been working | 497 |
|
| 3 | it have been [v-ing] | 414 |
|
| 4 | it have been work | 19 |
|
| 5 | it have be working | 17 |
|
| 6 | it have [be] working | 17 |
|
| 7 | it have [been] working | 17 |
|
| 8 | it [verb] been working | 17 |
|
