| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who have [adv] heard of | 26 |
|
| 2 | who have [adv] heard of | 21 |
|
| 3 | who have never heard of | 18 |
|
| 4 | who have never heard of | 18 |
|
| 5 | who had [adv] heard of | 15 |
|
| 6 | who have [adv] heard of | 6 |
|
| 7 | who have not heard of | 5 |
|
| 8 | who have [not/n't] heard of | 5 |
|
