| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [is] [conj] [det] [noun] | 539 |
|
| 2 | problem [be] [conj] [det] [noun] | 44 |
|
| 3 | problem [is] [conj] [adj] [noun] | 41 |
|
