use "AS" before a clause ,adverb, or prepositional phrase
use "AS IF"and "AS THOUGH" before a clause
"LIKE" is generally used as a preppsition in such a context ,AS is generally used as an adverb while sometimes serving as a preposition with the meaning of "in the capacity of "
as you can tell,the focus of the comparison shifts from the noun when used with "LIKE" to the verb when used with "AS ,AS IF ,AS THOUGH"（以下例题中，红色字体我标记的 comparison 部分，请指正）作者: xiongbaobao 时间: 2010-6-24 16:55
eg:
my mother's cheesecake tastes like glue.
i love frozen pizza because there is no othe snack like it
my mother's cheesecake tastes great ,as a mother's cheese cake should.
there are times, as now,that learning grammar becomes important
he golfed well again,as in the tournament last year.
he served as capain in the navy
he often told half-truths,as any politician would
he looks as if he knows me.
it looks as if a storm were on the way
he yelled at me as though it were on my fault.
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