| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [prep] [det] [noun] | 452 |
|
| 2 | have been developed [prep] [noun] | 122 |
|
| 3 | have been developed [prep] [det] | 27 |
|
| 4 | been developed [prep] [det] [noun] | 22 |
|
| 5 | have developed [prep] [det] [noun] | 18 |
|
