| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [been] [v-ing] a | 169 |
|
| 2 | has [been] [v-ing] in | 158 |
|
| 3 | [been] [v-ing] in a | 82 |
|
| 4 | has [been] in a | 43 |
|
