表示肯定和不肯定（Expressing certainty and uncertainty）[文章版权 禁止转载:考试与评价 http://www.trgroup.com.cn/te/ wkk =*TUO|^XBojFroG]

    1. I'm sure， I'm sure (that)...[文章版权 禁止转载:考试与评价 http://www.trgroup.com.cn/te/ 4,^4H=^3d9w&jFtw@jFroG]

    2. I'm not sure. I'm not sure whether/if...[文章版权 禁止转载:考试与评价 http://www.trgroup.com.cn/te/ aBeb LVZ`,l=h_f {FroG]

    3. Maybe. /Perhaps.[文章版权 禁止转载:考试与评价 http://www.trgroup.com.cn/te/ !KC k:1zE?`l-sBFroG]