| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [been] a [noun] | 1339 |
|
| 2 | has [been] a [noun sg] | 1300 |
|
| 3 | [verb] [been] a problem | 54 |
|
| 4 | have [been] a problem | 54 |
|
| 5 | [vb -s] [been] a problem | 21 |
|
| 6 | has [been] [art] problem | 20 |
|
| 7 | has [been] [art] problem | 20 |
|
| 8 | has [been] a problem | 16 |
|
| 9 | has [been] a problem | 16 |
|
| 10 | has [be] a problem | 16 |
|
