3. it 句式
(1)形式主语 it is +被动/形容词/名词+that从句/to do …
Eg1：It is suggested/ well-advised / supposed / proposed that sb. should (not) do …
Eg2：It is essential / necessary / advisable / convenient/ difficult/ hard/ comfortable for sb. (not) to do
Eg3：It is essential / necessary that sb. should (not) do …
Eg4：It is useless/useful doing sth.
(2)形式宾语
Eg1：An increasing number of students find it difficult to spell common words correctly.
Eg2：An increasing number of parents find it hard to have opportunities to chat with kids, who spend too much time on computers.
Eg3：A host of youngsters find it rather boring and hard to understand literature.
4. 强调句
(1)强调谓语：
Eg1：I love you. /I do love you. / I did love you.
Eg2：Cell phone/ Internet/ computer brings us convenience.
Cell phone/ Internet/ computer does bring us convenience.
(2)强调句式：It is/was +被强调成分+that/who+句子其他成分。
【步骤】
a. 先写出正确的简单句、并列句或复合句，明确单句的各个成分。
b. 在被强调成分(除谓语和补语外)两边添加it is/was 和that/who， 其他成分不变，必要时调整顺序。
【强调句式特征】去掉it is/was…that/who结构，整个句子无冗余或成分残缺。
Eg1：My mother always encourages me not to lose heart when I have difficulties in study.
It is my mother who/that always encourages me not to lose heart when I have difficulties in study.
It is when I have difficulties in study that my mother always encourages me not to lose heart.
Eg2：Parents’ protection does not enable kids to build up adequate ability to face social competition.
(强调句式否定形式)It is parents’ protection that does not enable kids to build up adequate ability to face social competition.
Eg3：The Internet does not enable some youngsters to spend adequate time in chatting with others face to face.
It is the Internet that does not enable some youngsters to spend adequate time in chatting with others face to face.
5. 倒装
(1)表否定的副词、短语或状语位于主语之前或句首，主句半倒装(一般疑问句语序);如never, seldom, hardly, scarcely, little, on no account, by mo means, in no case,
Eg1：I will never agree. Never will I agree.
(2)Only +状语位于句首，主句半倒装。
Eg1：When my beloved is beside myself, I can feel the true happiness.
Only when my beloved is beside myself, can I feel the true happiness.
Eg2：When his computer crashes, he will come down-stairs for something to eat.
Only when his computer crashes, will he come down-stairs for something to eat.
Eg3：By doing small things, teenagers can accumulate ability and experience for something big.
Only doing small thing, can teenagers accumulate ability and experience for something big.
(3)As/though倒装形式
Eg1：Although she is a girl, Zeng Yike is called Brother Zeng.
Girl as she is, Zeng Yike is called Brother Zeng.
Eg2：Though it is convenient, online shopping leads to some problems.
Convenient as/though it is, online shopping leads to some problems.
Eg3：Although it is simple, what the picture conveys is thought-provoking.
Simple as it is, what the picture conveys is thought-provoking.
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