| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [verb] [num] years of | 11 |
|
| 2 | it [vb past] [adj] years of | 10 |
|
| 3 | it took [adj] years of | 8 |
|
| 4 | it take [adj] years of | 8 |
|
