| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [v-ing] for several years | 14 |
|
| 2 | [be] [v-ing] for several years | 14 |
|
| 3 | [been] [v-ing] for several years | 14 |
|
| 4 | [be] [v-ing] for several years | 14 |
|
| 5 | be [v-ing] for several years | 14 |
|
