| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [v-ing] for a | 37 |
|
| 2 | has [been] [v-ing] for a | 37 |
|
| 3 | has [been] [v-ing] for a | 30 |
|
| 4 | has [been] [v-ing] for an | 7 |
|
| 5 | has [been] looking for a | 5 |
|
