| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a serious impact | 14 |
|
| 2 | have a serious impact | 13 |
|
| 3 | [vb infin] a serious impact | 6 |
|
| 4 | have a serious impact | 6 |
|
| 5 | a serious impact [prep] | 12 |
|
| 6 | a serious impact [prep] | 12 |
|
| 7 | a serious impact on | 11 |
|
| 8 | a serious impact on | 11 |
|
