| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be at once [verb] | 41 |
|
| 2 | [be] at once [vb pp] | 36 |
|
| 3 | [was/were] at once [verb] | 31 |
|
| 4 | was at once [verb] | 25 |
|
| 5 | [is] at once [verb] | 7 |
|
| 6 | is at once [verb] | 7 |
|
| 7 | were at once [verb] | 6 |
|
