| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been [verb] for several years | 19 |
|
| 2 | have been [verb] for several year | 19 |
|
| 3 | have been [verb] for several year | 19 |
|
| 4 | have been [v-ing] for several year | 14 |
|
| 5 | had been [verb] for several year | 8 |
|
| 6 | have been [vb pp] for several year | 5 |
|
| 7 | have been [verb] for several year | 5 |
|
