| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] a time [prep] | 55 |
|
| 2 | [adv] [prep] a time [prep] | 46 |
|
| 3 | once [prep] a [noun] [prep] | 44 |
|
| 4 | once [prep] a [noun sg] [prep] | 44 |
|
| 5 | once [prep] [art] time [prep] | 9 |
|
| 6 | once [prep] [art] time [prep] | 9 |
|
| 7 | once [prep] a time [prep] | 8 |
|
| 8 | once [prep] a time [prep] | 8 |
|
| 9 | once [prep] a time [prep] | 8 |
|
| 10 | once [prep] a time [prep] | 8 |
|
