| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [verb] at once | 79 |
|
| 2 | [noun sg] [vb past] [prep] once | 49 |
|
| 3 | [noun sg] [vb -s] [prep] once | 20 |
|
| 4 | [noun sg] [to-vb] [prep] once | 7 |
|
| 5 | [noun sg] [v-ing] [prep] once | 6 |
|
| 6 | [noun sg] [verb] for once | 6 |
|
