| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] at a | 8330 |
|
| 2 | [v-ing] at a | 1677 |
|
| 3 | speaking [prep] a | 337 |
|
| 4 | speaking [prep] a | 337 |
|
| 5 | speaking at [art] | 231 |
|
| 6 | speak at a | 131 |
|
| 7 | speaking at a | 95 |
|
