| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [been] [verb] for several years | 20 |
|
| 2 | been [verb] [prep] several years | 20 |
|
| 3 | [been] [v-ing] [prep] several years | 14 |
|
| 4 | [been] [vb pp] [prep] several years | 6 |
|
