| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [prep] [num] years [unc] | 46 |
|
| 2 | [is] [prep] [num] years ['s] | 46 |
|
| 3 | [is] [prep] [num] years ' | 46 |
|
| 4 | [is] [prep] [num] years ' | 46 |
|
| 5 | [is] of [num] years [unc] | 44 |
|
| 6 | [is] [prep] three years [unc] | 24 |
|
| 7 | [is] [prep] four years [unc] | 15 |
|
| 8 | [is] [prep] two years [unc] | 6 |
|
