| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] [prep] a few weeks | 12 |
|
| 2 | [v-ing] [prep] a few weeks | 12 |
|
| 3 | [v-ing] for a few weeks | 7 |
|
| 4 | [v-ing] for a few weeks | 7 |
|
