| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at a [adj] time [prep] | 71 |
|
| 2 | [vb -s] a [adj] time [prep] | 31 |
|
| 3 | [vb -s] at a [adj] time | 12 |
|
| 4 | [vb -s] at a time [prep] | 8 |
|
