“既A又B”与“既A也B”存在异同。二者的共同点是:用于属性判断、状态描写、事件陈述。它们根据所连接的小句凸现倾向不同又可分为不同的类型。留学生偏误在不同阶段呈现不同的特点,应该区别对待,最后提出习得策略。 Similarities and differences exist between “A and B” and “A and B”. The two have in common is: for attribute judgment, state description, event statement. According to the connected clauses, they show different tendencies and can be divided into different types. The students' errors show different characteristics at different stages and should be treated differently. Finally, the author proposes the acquisition strategy.