| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have made a major contribution to | 11 |
|
| 2 | [verb] made a major contribution to | 11 |
|
| 3 | [verb] made a major contribution to | 11 |
|
| 4 | has made a major contribution to | 7 |
|
| 5 | [vb -s] made a major contribution to | 7 |
|
