| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have [be] [v-ing] for several years | 14 |
|
| 2 | [verb] [be] [v-ing] for several years | 14 |
|
| 3 | [vb past] [be] [v-ing] for several years | 6 |
|
| 4 | [vb base] [be] [v-ing] for several years | 6 |
|
| 5 | had [be] [v-ing] for several years | 5 |
|
