| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [adv] been a problem | 23 |
|
| 2 | [vb -s] [adv] been a problem | 18 |
|
| 3 | [verb] always been a problem | 16 |
|
| 4 | has [adv] been a problem | 15 |
|
