| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] have had a [adj] effect | 12 |
|
| 2 | [verb] [verb] had a [adj] effect | 12 |
|
| 3 | [verb] to have had a [adj] effect | 11 |
|
| 4 | [verb] [to-vb] had a [adj] effect | 11 |
|
| 5 | seem [verb] had a [adj] effect | 6 |
|
