| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb mod] [verb] [adv] a year | 6 |
|
| 2 | it [modal v] [verb] [adv] a year | 6 |
|
| 3 | it [verb] [been] [adv] a year | 7 |
|
| 4 | it [verb] [be] [adv] a year | 7 |
|
| 5 | it [verb] been [adv] a year | 7 |
|
| 6 | it [verb] be [adv] a year | 7 |
|
| 7 | it [verb] [adv] [noun] a year | 6 |
|
| 8 | it [verb] [adv] [n mass] a year | 6 |
|
