| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [adv] have [been] a | 175 |
|
| 2 | may [adv] have [been] [art] | 99 |
|
| 3 | may [adv] have [been] [art] | 99 |
|
| 4 | may [adv] have [been] a | 60 |
|
| 5 | may [adv] have [been] a | 48 |
|
| 6 | may [adv] have [be] a | 44 |
|
| 7 | may [adv] [verb] [been] a | 44 |
|
| 8 | may [adv] [vb infin] [been] a | 44 |
|
| 9 | may [adv] have [been] a | 44 |
|
