| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb past] [prep] a [noun] | 801 |
|
| 2 | it [vb past] [prep] a [noun sg] | 754 |
|
| 3 | [pron] [vb past] [prep] a time | 51 |
|
| 4 | [pers pn] [vb past] [prep] a time | 45 |
|
| 5 | it [vb past] [prep] [art] time | 37 |
|
| 6 | it [verb] [prep] a time | 15 |
|
| 7 | it [vb past] [prep] a time | 8 |
|
| 8 | it [vb past] [prep] a time | 8 |
|
