英语四级复习必备作文常用关系词(五)

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条件关系:
　　if;
　　unless;
　　lest;
　　provided that;
　　if it is the case;
　　in this sense;
　　once...;
　　if possible;
　　if necessary;
　　if so;
　　if not all;
　　if anything.
　　归纳总结类：
　　in other words;
　　on the whole;
　　in sum;
　　therefore;
　　hence;
　　in short;
　　in brief;
　　to sum up;
　　in conclusion;
　　in summary;
　　to conclude;
　　the conclusion can be drawn that...;
　　for this reason;
        　　in short.