| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] at the time | 84 |
|
| 2 | [v-ing] at the time [prep] | 62 |
|
| 3 | [be] at the time [prep] | 53 |
|
| 4 | [be] [v-ing] the time [prep] | 13 |
|
