| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] twenty years | 307 |
|
| 2 | over twenty years | 106 |
|
| 3 | nearly twenty years | 50 |
|
| 4 | about twenty years | 46 |
|
| 5 | almost twenty years | 33 |
|
| 6 | least twenty years | 17 |
|
| 7 | only twenty years | 8 |
|
| 8 | even twenty years | 8 |
|
| 9 | just twenty years | 6 |
|
| 10 | perhaps twenty years | 6 |
|
