| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may be [vb pp] [prep] certain [noun] | 16 |
|
| 2 | may be [verb] [prep] certain [noun] | 16 |
|
| 3 | may be [verb] [prep] certain [noun pl] | 15 |
|
| 4 | may be [verb] in certain [noun] | 5 |
|
