| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [verb] [be] ten years | 5 |
|
| 2 | it [verb] been ten years | 5 |
|
| 3 | it [verb] [been] ten years | 5 |
|
| 4 | it [verb] be ten years | 5 |
|
| 5 | it [verb] ten years [prep] | 7 |
|
| 6 | it [verb] ten years [prep] | 7 |
|
