| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [v-ing] for several | 24 |
|
| 2 | had been [v-ing] [prep] several | 10 |
|
| 3 | has been [v-ing] [prep] several | 7 |
|
| 4 | have been running [prep] several | 5 |
|
