| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [adv] a certain number | 6 |
|
| 2 | be [adv] a certain number | 6 |
|
| 3 | [adv] a certain number of | 16 |
|
| 4 | [adv] a certain number of | 16 |
|
| 5 | [adv] a certain number [prep] | 16 |
|
| 6 | [adv] a certain number [prep] | 16 |
|
