| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have [vb pp] a [adj] effect | 7 |
|
| 2 | which have [verb] a [adj] effect | 7 |
|
| 3 | which have had a [adj] effect | 7 |
|
| 4 | which have have a [adj] effect | 7 |
|
| 5 | which has [verb] a [adj] effect | 5 |
|
