| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] be [adv] sure [conj] | 25 |
|
| 2 | could [adv] be sure [conj] | 24 |
|
| 3 | could [adv] be [adv] [conj] | 18 |
|
| 4 | could [adv] be [adv] sure | 16 |
|
