| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] at a [noun] [prep] | 370 |
|
| 2 | [v-ing] at a [noun sg] [prep] | 363 |
|
| 3 | [v-ing] at [art] time [prep] | 69 |
|
| 4 | [verb] at a time [prep] | 64 |
|
| 5 | [v-ing] [prep] a time [prep] | 13 |
|
| 6 | [v-ing] [prep] a time [prep] | 13 |
|
| 7 | [v-ing] at a time [prep] | 7 |
|
| 8 | [v-ing] at a time [prep] | 7 |
|
