| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | main [noun] be | 2347 |
|
| 2 | [adj] problem be | 1782 |
|
| 3 | [adj] problem be | 1022 |
|
| 4 | main problem [be] | 115 |
|
| 5 | main problem be | 115 |
|
