| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may have been [verb] in | 90 |
|
| 2 | [modal v] have been [v-ing] in | 58 |
|
| 3 | may have been [v-ing] [prep] | 40 |
|
| 4 | may have been [v-ing] [prep] | 40 |
|
| 5 | may have been [v-ing] in | 12 |
|
| 6 | may [verb] been [v-ing] in | 12 |
|
| 7 | may have [been] [v-ing] in | 12 |
|
| 8 | may have [be] [v-ing] in | 12 |
|
| 9 | may [vb infin] been [v-ing] in | 12 |
|
| 10 | may have been [v-ing] in | 12 |
|
| 11 | may have be [v-ing] in | 12 |
|
