| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [prep] three years [unc] | 25 |
|
| 2 | be [prep] three years ' | 25 |
|
| 3 | be [prep] three years ' | 25 |
|
| 4 | be [prep] three years ['s] | 25 |
|
| 5 | be of three years [unc] | 24 |
|
| 6 | be of three years [unc] | 24 |
|
| 7 | is [prep] three years [unc] | 24 |
|
