| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be [vb pp] [prep] a time | 21 |
|
| 2 | [modal v] be [vb pp] [prep] a time | 21 |
|
| 3 | [modal v] be [vb pp] [prep] a time | 21 |
|
| 4 | [modal v] be [vb pp] at a time | 16 |
|
| 5 | [modal v] be [vb pp] at a time | 16 |
|
| 6 | can be [vb pp] [prep] a time | 8 |
|
| 7 | can be [vb pp] [prep] a time | 8 |
|
