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3. it 句式

（1）形式主語 it is +被動(dòng)/形容詞/名詞+that從句/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）形式賓語

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. 強(qiáng)調(diào)句

（1）強(qiáng)調(diào)謂語：

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）強(qiáng)調(diào)句式：It is/was +被強(qiáng)調(diào)成分+that/who+句子其他成分。

【步驟】

a. 先寫出正確的簡單句、并列句或復(fù)合句，明確單句的各個(gè)成分。

b. 在被強(qiáng)調(diào)成分（除謂語和補(bǔ)語外）兩邊添加it is/was 和that/who， 其他成分不變，必要時(shí)調(diào)整順序。

【強(qiáng)調(diào)句式特征】去掉it is/was…that/who結(jié)構(gòu)，整個(gè)句子無冗余或成分殘缺。

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.

（強(qiáng)調(diào)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.