一.instead意为“代替”“替代”,作副词用,通常位于句尾.如位于句首时常用逗号与后面阁开.instead在顺接句子中作“代替”讲,而在转折（或逆转）句子中作“然而”讲. 例如：1.Lily isn't here.Ask Lucy instead. Lily不在这儿,去问Lucy吧.[注意]当instead在祈使句中时,只能位于句末. 2.she didn't answer me,instead,she asked me another question. 她没有回答我,反而问了我另外一个问题. 二.instead of是介宾短语,其意与instead相同,不同之处在于它后面常接宾语,起宾语多由名词、代词、介词、短语、动词+ing形式充当. 例如：1.We'll ask Li Mei instead of Mary. 我们将去问李梅而不问玛丽. 2.I'll go instead of her. 我会替她去. 三.instead与instead of的转换. 例如:1.He didn't answer me,instead,he asked me another question→He asked me another question instead of answering me. 2.I'll of instead of her.→She won't go.I'll go instead