| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [to-vb] at the time | 19 |
|
| 2 | [vb past] [to-vb] at [art] time | 10 |
|
| 3 | [verb] [to-vb] at a time | 8 |
|
| 4 | [v-ing] [to-vb] at [art] time | 5 |
|
| 5 | [vb infin] [to-vb] at [art] time | 5 |
|
