| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] it have been a | 15 |
|
| 2 | [vb base] it [vb -s] been a | 12 |
|
| 3 | [vb base] it 's been a | 10 |
|
| 4 | think it [verb] been a | 7 |
|
