| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb infin] at once | 139 |
|
| 2 | go [prep] once | 24 |
|
| 3 | see [prep] once | 18 |
|
| 4 | answer [prep] once | 13 |
|
| 5 | come [prep] once | 11 |
|
| 6 | know [prep] once | 10 |
|
| 7 | reply [prep] once | 5 |
|
| 8 | [vb infin] for once | 5 |
|
