| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | for a short period [prep] | 49 |
|
| 2 | [adv] for a period [prep] | 26 |
|
| 3 | [adv] for a short period | 21 |
|
| 4 | [adv] a short period [prep] | 12 |
|
