| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a problem | 1141 |
|
| 2 | become a [noun] | 924 |
|
| 3 | become a [noun sg] | 908 |
|
| 4 | [vb pp] a problem | 176 |
|
| 5 | become a problem | 62 |
|
| 6 | become a problem | 9 |
|
| 7 | become [art] problem | 9 |
|
