like 作为介词，其意为"像"，应用于 look like, be like, sound like, 其后要加宾语。而alike是形容词，或副词，如: You and I think alike. The twins are dressed alike。 但alike 仅作表语而不能用于名词前作定语。
[误] Who is taller of the two?
[正] Who is the taller of the two?
[析] 两者的比较级之前要加定冠词。
[误] I have less books than Tom.
[正] I have fewer books than Tom.
[析] less 是 little的比较级，而fewer是few的比较级。less后应加不可数名词而fewer后是可数名词。
[误] There are three girls in my group. The cleverer is Mary.
[正] There are three girls in my group. The cleverest is Mary.
[析] 在两者之间应用比较级，在三者之间或三者以上的范围内应用最高级。
[误] The boy sat there as quiet as his sister.
[正] The boy sat there as quietly as his sister.
[析] as…as的用法要注意的是：①在其中间应加形容词或副词的原级，而不可加比较级，也有的语法书中称为同级比较。②要根据句意决定是加形容词还是副词，这要看它具体是修饰动词还是名词而定，如：He is as good as his friend.
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