| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [noun] [modal v] occur | 376 |
|
| 2 | [adj] [noun pl] [modal v] occur | 153 |
|
| 3 | [adj] problems [modal v] [verb] | 124 |
|
| 4 | [adj] problems [modal v] [vb infin] | 124 |
|
| 5 | [adj] problem [modal v] occur | 8 |
|
| 6 | [adj] problems [modal v] occur | 7 |
|
