| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [adv] [prep] about two years | 7 |
|
| 2 | [verb] [adv] [prep] about two years | 7 |
|
| 3 | [verb] [adv] for about two years | 6 |
|
| 4 | [verb] [adv] for about two years | 6 |
|
