| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [modal v] have a [adj] duty | 5 |
|
| 2 | [noun] [modal v] have a [adj] duty | 5 |
|
| 3 | [noun] [modal v] have a duty [verb] | 7 |
|
| 4 | [noun] [modal v] have a duty [to-vb] | 6 |
|
