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