| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when there [is] [adv] a | 15 |
|
| 2 | when there is [adv] a | 14 |
|
| 3 | when there [is] [adv] a | 10 |
|
| 4 | when there [is] not a | 5 |
|
| 5 | when there [is] [not/n't] a | 5 |
|
