| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [been] [v-ing] a | 781 |
|
| 2 | have [been] [v-ing] on | 530 |
|
| 3 | have [been] on a | 112 |
|
| 4 | [been] [v-ing] on a | 61 |
|
