| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | can [adv] have been [adj] | 56 |
|
| 2 | can [adv] have been [adj] | 45 |
|
| 3 | can not have been [adj] | 39 |
|
| 4 | can [not/n't] have been [adj] | 39 |
|
| 5 | can not have been [adj] | 28 |
|
| 6 | can [adv] have been [adj] | 17 |
|
| 7 | can [adv] have been easy | 14 |
|
| 8 | can n't have been [adj] | 11 |
|
| 9 | ca [adv] have been [adj] | 11 |
|
| 10 | can hardly have been [adj] | 10 |
|
| 11 | can hardly have been [adj] | 10 |
|
