| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] at a [adj] | 510 |
|
| 2 | at a [adj] time | 380 |
|
| 3 | [v-ing] a [adj] time | 352 |
|
| 4 | [v-ing] at [adj] time | 96 |
|
| 5 | [v-ing] at a time | 34 |
|
