| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] have become [art] [adj] problem | 9 |
|
| 2 | [noun sg] have become [art] [adj] problem | 5 |
|
| 3 | have become [art] [adj] problem [prep] | 8 |
|
| 4 | have become [art] [adj] problem [prep] | 8 |
|
