| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [noun] | 490653 |
|
| 2 | [prep] a [noun sg] | 465202 |
|
| 3 | [prep] [art] time | 22496 |
|
| 4 | [prep] a time | 4735 |
|
| 5 | [prep] a time | 4727 |
|
