| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [vb pp] for 30 minute | 10 |
|
| 2 | [be] [vb pp] for 30 minute | 10 |
|
| 3 | [was/were] [vb pp] for 30 minute | 10 |
|
| 4 | were [vb pp] for 30 minute | 5 |
|
| 5 | was [vb pp] for 30 minute | 5 |
|
| 6 | [vb pp] for 30 minute [prep] | 6 |
|
| 7 | [vb pp] for 30 minute [prep] | 6 |
|
