| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] [prep] a | 16321 |
|
| 2 | [prep] a period | 2139 |
|
| 3 | [to-vb] a period | 44 |
|
| 4 | [to-vb] [prep] period | 23 |
|
