| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should have been [adj] | 227 |
|
| 2 | [modal v] have been able | 194 |
|
| 3 | should have [been] able | 28 |
|
| 4 | should have [be] able | 28 |
|
| 5 | should have be able | 28 |
|
| 6 | should [verb] been able | 28 |
|
