| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have become a important [noun] | 26 |
|
| 2 | have become [art] important [noun] | 26 |
|
| 3 | have become an important [noun] | 26 |
|
| 4 | have become [art] important [noun sg] | 26 |
|
| 5 | has become [art] important [noun] | 21 |
|
