| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when [noun] [vb -s] [prep] a | 29 |
|
| 2 | when [noun prp] [vb -s] [prep] a | 16 |
|
| 3 | when [noun sg] [vb -s] [prep] a | 12 |
|
| 4 | when [noun] [vb -s] in a | 11 |
|
