| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had been [v-ing] for [det] years | 19 |
|
| 2 | have been [v-ing] for several years | 14 |
|
| 3 | have been [v-ing] for many years | 13 |
|
| 4 | have been [v-ing] for some years | 9 |
|
| 5 | has been [v-ing] for [det] years | 7 |
|
| 6 | have been [v-ing] for [det] years | 7 |
|
