| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun] [prep] a time | 240 |
|
| 2 | [prep] [noun pl] [prep] a time | 102 |
|
| 3 | [prep] months [prep] a [noun] | 22 |
|
| 4 | [prep] months [prep] a [noun sg] | 20 |
|
| 5 | [prep] months [prep] a time | 16 |
|
| 6 | [prep] months [prep] [art] time | 16 |
|
| 7 | [prep] months [prep] a time | 16 |
|
| 8 | [prep] months [prep] a time | 16 |
|
| 9 | [prep] month [prep] a time | 16 |
|
| 10 | [prep] months [prep] [art] time | 16 |
|
