| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] a [adj] contribution to | 11 |
|
| 2 | be [v-ing] a [adj] contribution to | 11 |
|
| 3 | [be] [v-ing] a [adj] contribution to | 10 |
|
| 4 | [be] making a [adj] contribution to | 10 |
|
| 5 | [is] [v-ing] a [adj] contribution to | 6 |
|
| 6 | is [v-ing] a [adj] contribution to | 6 |
|
