| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has [been] [v-ing] for | 270 |
|
| 2 | [been] [v-ing] for a | 205 |
|
| 3 | has [been] [v-ing] a | 169 |
|
| 4 | has [been] for a | 12 |
|
