| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [prep] three [noun pl] ' duration | 26 |
|
| 2 | [be] [prep] three [noun pl] ' duration | 26 |
|
| 3 | is [prep] three [noun pl] ' duration | 24 |
|
| 4 | [is] [prep] three [noun pl] ' duration | 24 |
|
