| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] have been a [adj] | 896 |
|
| 2 | system have been [art] [adj] | 10 |
|
| 3 | system have been a [adj] | 10 |
|
| 4 | system have been [art] [adj] | 10 |
|
| 5 | system [verb] been a [adj] | 9 |
|
| 6 | system have [be] a [adj] | 9 |
|
| 7 | system have [been] a [adj] | 9 |
|
| 8 | system have be a [adj] | 9 |
|
