| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it has [been] [verb] | 3607 |
|
| 2 | it has [been] [v-ing] | 132 |
|
| 3 | it has [been] develop | 23 |
|
| 4 | [pron] has [been] developing | 11 |
|
| 5 | it have [been] developing | 7 |
|
| 6 | it [verb] [been] developing | 7 |
|
| 7 | it has [be] developing | 5 |
|
| 8 | it [vb -s] [been] developing | 5 |
|
