| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] to be sure [prep] | 18 |
|
| 2 | [adj] to be sure [prep] | 18 |
|
| 3 | [adj] to be sure [prep] | 18 |
|
| 4 | [adj] to be sure of | 14 |
|
| 5 | [adj] to be sure of | 14 |
|
| 6 | difficult to be sure [prep] | 7 |
|
| 7 | difficult to be sure [prep] | 7 |
|
