| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] [been] [verb] [prep] twenty [noun] | 6 |
|
| 2 | [vb -s] [been] [verb] [prep] twenty [noun pl] | 6 |
|
| 3 | [vb -s] [been] [verb] [prep] twenty years | 5 |
|
| 4 | [vb -s] [been] [verb] [prep] twenty year | 5 |
|
