| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] when it [is] | 31 |
|
| 2 | [vb -s] when it [is] | 31 |
|
| 3 | [vb -s] when it is | 18 |
|
| 4 | [vb -s] when it 's | 13 |
|
| 5 | happens when it [is] | 7 |
|
