| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [prep] [num] year ['s] [noun sg] | 48 |
|
| 2 | [is] [prep] [num] year ' [noun sg] | 46 |
|
| 3 | [is] [prep] [num] year ['s] duration | 46 |
|
| 4 | [is] [prep] [num] years ['s] [noun sg] | 46 |
|
| 5 | [is] of [num] year ['s] [noun sg] | 45 |
|
| 6 | [is] [prep] three year ['s] [noun sg] | 24 |
|
| 7 | [is] [prep] four year ['s] [noun sg] | 15 |
|
| 8 | [is] [prep] two year ['s] [noun sg] | 7 |
|
