摘要：She enjoys all kinds of music, as I do. (她和我一样喜欢各种各样的音乐。) [从句]

as和like都可以表达“相似”，但二者也有差异。

like是介词，它后面是名词[短语]或代词，如

【例句1】He has blue eyes like me. (他和我一样有一双蓝眼睛。)

as是连词和副词，用作从句、副词或介词短语前面，如

【例句2】She enjoys all kinds of music, as I do. (她和我一样喜欢各种各样的音乐。) [从句]

【例句3】As ever, he was friendly and helpful. （他一如既往地友好和乐于助人。）[副词]

【例句4】Repeat these five steps, as in the last exercise. (重复这五个步骤，就像上一个练习一样。) [介词短语]

对非标准英语，like也经常被用作连词和副词，如

【例句5】Nobody understands him like I do. （没有人像我一样理解他。）

【例句6】I don't want to upset him again like before. （我不想再像以前那样惹他生气了。）

对规范表达，【例句5】和【例句6】的like应换成as。

like也用于替代as if, 如

【例句7】It looks like we're going to be late. （看来我们要迟到了。）

【例句5,6,7】这样用法现在很常见，但在正式表达中算语法错误。

来源：历史小黑板