| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it has been [verb] | 478 |
|
| 2 | [subord] it has been [vb pp] | 465 |
|
| 3 | [conj] it has been developed | 7 |
|
| 4 | [subord] it [verb] been developed | 7 |
|
| 5 | [subord] it have been developed | 7 |
|
| 6 | [subord] [pron] has been developed | 5 |
|
| 7 | [subord] it has be developed | 5 |
|
| 8 | [subord] it has [been] developed | 5 |
|
| 9 | [subord] it has been develop | 5 |
|
| 10 | [subord] it has [be] developed | 5 |
|
| 11 | [subord] it [vb -s] been developed | 5 |
|
