| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] problem [modal v] [be] | 14 |
|
| 2 | a [adj] problem [modal v] [be] | 12 |
|
| 3 | a problem [pron] [modal v] [be] | 10 |
|
| 4 | a problem which [modal v] [be] | 7 |
|
| 5 | a problem [Wh det] [modal v] [be] | 7 |
|
| 6 | a problem which [modal v] [be] | 7 |
|
| 7 | a problem [noun] [modal v] [be] | 6 |
|
| 8 | a problem [noun sg] [modal v] [be] | 5 |
|
| 9 | a problem [modal v] [be] [verb] | 8 |
|
| 10 | a problem [modal v] [be] [vb pp] | 7 |
|
