| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] could [vb infin] [be] achieved [prep] | 5 |
|
| 2 | [adj] could have [be] achieved [prep] | 5 |
|
| 3 | [adj] could [verb] [been] achieved [prep] | 5 |
|
| 4 | [adj] could [verb] be achieved [prep] | 5 |
|
| 5 | [adj] could [verb] [be] achieved [prep] | 5 |
|
| 6 | [adj] could [verb] been achieved [prep] | 5 |
|
| 7 | [det] could [verb] [be] achieved [prep] | 5 |
|
| 8 | [adj] could have [be] achieved [prep] | 5 |
|
