| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun] at the time | 593 |
|
| 2 | [prep] [noun] [v-ing] at the | 141 |
|
| 3 | [noun] [v-ing] at the time | 34 |
|
| 4 | [prep] [v-ing] at the time | 19 |
|
