| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be based [prep] [noun] | 162 |
|
| 2 | be based [prep] [noun] [Wh det] | 24 |
|
| 3 | [modal v] be [prep] [noun] [Wh det] | 15 |
|
