| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [v-ing] for several years | 14 |
|
| 2 | had been [v-ing] for several [noun pl] | 10 |
|
| 3 | has been [v-ing] for several [noun pl] | 6 |
|
| 4 | have been running for several [noun pl] | 5 |
|
