| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] while he [was/were] [prep] | 5 |
|
| 2 | [vb past] while he [be] [prep] | 5 |
|
| 3 | [vb past] while he [be] [prep] | 5 |
|
| 4 | [vb past] while he be [prep] | 5 |
|
| 5 | [vb past] while he was [prep] | 5 |
|
