| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been empty for [adj] [noun pl] | 12 |
|
| 2 | [verb] been empty for [adj] [noun pl] | 12 |
|
| 3 | has been empty for [adj] [noun pl] | 6 |
|
| 4 | [vb -s] been empty for [adj] [noun pl] | 6 |
|
