| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] a [adj] [noun] | 660 |
|
| 2 | [modal v] [vb infin] a long [noun] | 252 |
|
| 3 | must [vb infin] [art] long [noun] | 8 |
|
| 4 | must [verb] a long [noun] | 7 |
|
