| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] must [be] | 11000 |
|
| 2 | answer [vb mod] [be] | 280 |
|
| 3 | answer [modal v] [be] | 280 |
|
| 4 | answer must [be] | 60 |
|
