“只要……就”与“只有……才”都表条件关系,使用频率极高,但稍不注意,也会出错。如:①只要年满十八岁就有选举权。②只有骄傲自满,才会使人落后。为什么会出现这种错误呢?主要是使用者未搞清两组关联词的区别:“只要……就”一般表示的是充分条件。所谓充分条件,即“有甲必有乙”, “As long as ...” and “only ...... only” all the conditions of the table, the use of high frequency, but a little careless, will be wrong. Such as: ① as long as the age of eighteen have the right to vote. ② only proud of complacency, will make people behind. Why is there such a mistake? The main reason is that the user did not find out the difference between the two groups of related words: “as long as ...” generally indicates sufficient conditions. The so-called sufficient conditions, that “there is a must B”