| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [prep] [num] years | 65 |
|
| 2 | is of [num] year | 46 |
|
| 3 | is [prep] three year | 27 |
|
| 4 | is for [num] year | 24 |
|
| 5 | is [prep] four year | 15 |
|
| 6 | is [prep] [num] year | 11 |
|
| 7 | is [prep] two year | 11 |
|
| 8 | is [prep] one year | 7 |
|
