| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [prep] two years ' | 8 |
|
| 2 | be [prep] two years ' | 8 |
|
| 3 | be of two years ' | 7 |
|
| 4 | be of two years ' | 7 |
|
| 5 | is [prep] two years ' | 6 |
|
