| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they have been [verb] for years | 7 |
|
| 2 | they have [been] [v-ing] for years | 7 |
|
| 3 | they have [been] [verb] for years | 7 |
|
| 4 | they 've [been] [verb] for years | 5 |
|
