| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | research be [vb pp] [verb] these [noun pl] | 5 |
|
| 2 | research be [verb] [verb] these [noun pl] | 5 |
|
| 3 | research be [verb] [to-vb] these [noun pl] | 5 |
|
