| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [v-ing] for an | 31 |
|
| 2 | had be [v-ing] for an | 12 |
|
| 3 | has be [v-ing] for an | 7 |
|
| 4 | have be looking for an | 7 |
|
