| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | for [adj] years | 9030 |
|
| 2 | [prep] 20 years | 501 |
|
| 3 | [prep] 20 years | 501 |
|
| 4 | for 20 [noun] | 429 |
|
| 5 | for 20 [noun pl] | 400 |
|
| 6 | for 20 year | 221 |
|
| 7 | for 20 years | 221 |
|
