情态动词：can
shuold
would
need
（not）后面跟动词原形
定语从句：分限定性和非限定性两种。限定性后面的定语在句中做成分，用that、who、where、when等词引导
eg.he
has
a
apple
that
had
washed；非限定性定语从句的定语只是对被修饰成分进行补充说明，把它去掉主句仍为完整句子，多用which引导
eg.he
has
a
apple,which
is
given
by
his
mother.
名词性从句：被修饰的名词在主句中做主语或宾语，在从句中做主语、宾语、表语或同谓语。eg.he
is
what
he
was
10
years
ago.
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