| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [been] [v-ing] on for years | 14 |
|
| 2 | have [been] [v-ing] on for years | 14 |
|
| 3 | [vb -s] [been] [v-ing] on for years | 9 |
|
| 4 | has [been] [v-ing] on for years | 7 |
|
| 5 | [been] [v-ing] on for [adj] years | 14 |
|
| 6 | [been] [v-ing] on for [num] years | 9 |
|
| 7 | [been] [v-ing] on for [det] years | 5 |
|
