| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] about [adj] | 5361 |
|
| 2 | [prep] about [num] | 5079 |
|
| 3 | [prep] [adv] 20 | 541 |
|
| 4 | [prep] about 20 | 143 |
|
