| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] have been a [adj] feature | 18 |
|
| 2 | [noun] [vb -s] been a [adj] feature | 11 |
|
| 3 | [noun] has been a [adj] feature | 11 |
|
| 4 | [noun sg] [verb] been a [adj] feature | 9 |
|
| 5 | [noun pl] [verb] been a [adj] feature | 8 |
|
