| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [verb] for three years | 25 |
|
| 2 | has been [verb] [prep] three years | 18 |
|
| 3 | have been [vb pp] [prep] three years | 18 |
|
| 4 | have been [v-ing] [prep] three years | 11 |
|
| 5 | had been [verb] [prep] three years | 5 |
|
