| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb past] half a hour | 5 |
|
| 2 | it [vb past] [det] a hour | 5 |
|
| 3 | it [vb past] [adj] an hour | 5 |
|
| 4 | it [vb past] half a hour | 5 |
|
