| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] through a period | 15 |
|
| 2 | [v-ing] for a period | 11 |
|
| 3 | going [prep] a period | 8 |
|
| 4 | [v-ing] in a period | 8 |
|
| 5 | [v-ing] from a period | 5 |
|
| 6 | passing [prep] a period | 5 |
|
