| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | after [adj] years | 1853 |
|
| 2 | after [num] years | 1681 |
|
| 3 | [prep] 18 years | 112 |
|
| 4 | after 18 [noun] | 57 |
|
| 5 | after 18 [noun pl] | 51 |
|
| 6 | after 18 years | 12 |
|
| 7 | after 18 year | 12 |
|
