| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [v-ing] [prep] | 6057 |
|
| 2 | have been [prep] a | 790 |
|
| 3 | have been [v-ing] a | 781 |
|
| 4 | been [v-ing] [prep] a | 582 |
|
