| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] been [v-ing] on for years | 9 |
|
| 2 | [vb -s] been [verb] on for years | 9 |
|
| 3 | [vb -s] been go on for years | 9 |
|
| 4 | [vb -s] been going on for years | 8 |
|
| 5 | has been [verb] on for years | 7 |
|
