| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [prep] a major problem | 5 |
|
| 2 | [noun] [prep] a major problem | 5 |
|
| 3 | [prep] be a major problem | 6 |
|
| 4 | [prep] [be] a major problem | 6 |
|
| 5 | [prep] be a major problem | 6 |
|
| 6 | [prep] [be] a major problem | 6 |
|
| 7 | [prep] a major [adj] problem | 9 |
|
| 8 | [prep] a major [adj] problem | 9 |
|
| 9 | [prep] a major social problem | 5 |
|
| 10 | [prep] a major social problem | 5 |
|
