句子是由詞或短語按語法規(guī)則組成，表達(dá)一個完整意思的語言單位。好的英語句子應(yīng)該是結(jié)構(gòu)意思正確完整，連貫流暢，言簡意賅。但是如果一篇文章中所有的句子都是結(jié)構(gòu)單一(以主語開頭，采用"主-謂-賓"或"主-謂-表"的結(jié)構(gòu))、長短均等的話，句子寫得再好，文章也是單調(diào)呆板，缺乏生氣。要克服這種句式"單一"現(xiàn)象，可以通過變換句子開頭以及句式兩種手段。
一、句子開頭多樣化來源：www.examda.com
寫作時最常見的是用名詞或代詞構(gòu)成的主語作為句子的開頭。除了主語外，句子中還有以下幾種成分可以作為句子的開頭。
1.以同位語作為句子的開頭。試比較下列兩個句子：
A. Xiao Wang, our monitor，will attend the meeting.
B. Our monitor, Xiao Wang, will attend the meeting.
句A以主語Xiao Wang開頭，句B以同位語Our monitor開頭。
2.以單個修飾語作為句子的開頭。
這個修飾語可以是形容詞、分詞或副詞。試比較下面幾組句子：
A. She is young and ambitious, she works hard to get the job.
B. Young and ambitious, she works hard to get the job.
句A以主語She開頭，句B以形容詞短語Young and ambitious開頭。
C. The girl entered the room gracefully.
D. Gracefully, the girl entered the room.
句C以主語The girl開頭，句D以副詞Gracefully開頭。
E. The students reached the top of the mountain exhausted.
F. Exhausted, the students reached the top of the mountain.
句E以主語The students開頭，句F以過去分詞Exhausted開頭。
3.以短語修飾語作為句子的開頭。
短語修飾語可以是介詞短語、不定式短語、分詞短語以及獨立主格結(jié)構(gòu)。試比較下列各組句子：
A. A beautiful girl stood in front of me.
B. In front of me stood a beautiful girl.
句A以主語A beautiful girl開頭，句B以介詞短語In front of開頭。
C. The students worked hard to pass the exam.
D. To pass the exam, the students worked hard.
句C以主語The students開頭，句D以不定式短語To pass the exam開頭。
E. He was confused about the problem and went to ask for his teacher.
F. Confused about the problem, he went to ask for his teacher.
句E以主語He開頭，句F以過去分詞短語Confused about開頭。
G. You may go home after you finish your homework.
H. Your homework finished, you may go home.
句G以主語You開頭，句H以獨立主格結(jié)構(gòu)Your homework finished開頭。
4.用從句作為句子的開始。試比較下列句子：
A. I will attend your lecture if I am free.
B. If I am free, I will attend your lecture.
C. We all know she is famous.
D. That she is famous is known to us all.
句A和句C以主語開始，句B和句D以從句開始。
值得注意的是句子的開頭與句子所需強(qiáng)調(diào)的意義密切相關(guān)。改變詞序有時會導(dǎo)致句子意義的細(xì)微變化。因此，在特定的上下文中決定是否改變某一句子的詞序時，不僅要考慮我們所要表達(dá)的意思(如為了強(qiáng)調(diào)句子中的某個成分，將正常語序中較晚出現(xiàn)的成分移到句首)，還要考慮是否有利于上下文的銜接過渡以及句子是否均衡等。
二、句式的多樣化
句式多樣化是對一篇好的文章的基本要求。要做到這一點，首先要對英語句子有充分的了解。英語句子種類很多，句法結(jié)構(gòu)豐富多彩。通?？梢园凑找韵聵?biāo)準(zhǔn)對英語句子進(jìn)行分類：
1.根據(jù)使用目的的不同，將句子分為陳述句，疑問句，祈使句和感嘆句。
(1)陳述句說明一個事實或是陳述說話人的看法。例如：
A. He must have finished his homework.
B. She is a diligent student.
(2)疑問句提出問題。例如：
A. Does she know English?
B. What did you do last night?
(3)祈使句用來表示請求，命令，叮囑，邀請，勸告等。例如：
A. Have a cup of tea.
B. Don't smoke.
(4)感嘆句表示說話時的驚訝，喜悅，氣憤等情緒。例如：
A. What an interesting film!
B. How beautiful it is!
2.根據(jù)語法結(jié)構(gòu)的不同，將句子分為簡單句，并列句，復(fù)合句以及并列復(fù)合句。
(1)如果一個句子只有一個主謂結(jié)構(gòu)，這個句子是簡單句。例如：
A. She has finished her homework.
B. Both my brother and sister are teachers.
(2)如果一個句子包含兩個或兩個以上的互不依從的主謂結(jié)構(gòu)，這個句子是并列句。并列句中的兩個或兩個以上的主謂結(jié)構(gòu)通常由逗號和并列連詞來連接。例如：
A. Honey is sweet, but the bee stings.
B. Type O is the most common blood type in the world, and type AB is the rarest.
(3)如果一個句子包含兩個或兩個以上的主謂結(jié)構(gòu)，其中一個或一個以上的主謂結(jié)構(gòu)充當(dāng)另一個主謂結(jié)構(gòu)中的某一(些)成分，如主語，賓語，定語等，該句為復(fù)合句。例如：
A. Because the luxury liner was traveling so fast, it was impossible to avoid the ghostly looking iceberg.
C. Some people say that it may result in some social problems in the future.
(4)當(dāng)一個并列句中的一個(或更多的)主謂結(jié)構(gòu)中包含有一個(或更多的)主謂結(jié)構(gòu)時，這種句子為并列復(fù)合句。例如：
A. He was watching me or something for an hour or two, drawing back the curtain so little lest I catch him, but I saw his face, and I think I can see the anxiety upon it, the worried impatience.
B. I have brought what you need, but you haven't brought what I need.
一、句子開頭多樣化來源：www.examda.com
寫作時最常見的是用名詞或代詞構(gòu)成的主語作為句子的開頭。除了主語外，句子中還有以下幾種成分可以作為句子的開頭。
1.以同位語作為句子的開頭。試比較下列兩個句子：
A. Xiao Wang, our monitor，will attend the meeting.
B. Our monitor, Xiao Wang, will attend the meeting.
句A以主語Xiao Wang開頭，句B以同位語Our monitor開頭。
2.以單個修飾語作為句子的開頭。
這個修飾語可以是形容詞、分詞或副詞。試比較下面幾組句子：
A. She is young and ambitious, she works hard to get the job.
B. Young and ambitious, she works hard to get the job.
句A以主語She開頭，句B以形容詞短語Young and ambitious開頭。
C. The girl entered the room gracefully.
D. Gracefully, the girl entered the room.
句C以主語The girl開頭，句D以副詞Gracefully開頭。
E. The students reached the top of the mountain exhausted.
F. Exhausted, the students reached the top of the mountain.
句E以主語The students開頭，句F以過去分詞Exhausted開頭。
3.以短語修飾語作為句子的開頭。
短語修飾語可以是介詞短語、不定式短語、分詞短語以及獨立主格結(jié)構(gòu)。試比較下列各組句子：
A. A beautiful girl stood in front of me.
B. In front of me stood a beautiful girl.
句A以主語A beautiful girl開頭，句B以介詞短語In front of開頭。
C. The students worked hard to pass the exam.
D. To pass the exam, the students worked hard.
句C以主語The students開頭，句D以不定式短語To pass the exam開頭。
E. He was confused about the problem and went to ask for his teacher.
F. Confused about the problem, he went to ask for his teacher.
句E以主語He開頭，句F以過去分詞短語Confused about開頭。
G. You may go home after you finish your homework.
H. Your homework finished, you may go home.
句G以主語You開頭，句H以獨立主格結(jié)構(gòu)Your homework finished開頭。
4.用從句作為句子的開始。試比較下列句子：
A. I will attend your lecture if I am free.
B. If I am free, I will attend your lecture.
C. We all know she is famous.
D. That she is famous is known to us all.
句A和句C以主語開始，句B和句D以從句開始。
值得注意的是句子的開頭與句子所需強(qiáng)調(diào)的意義密切相關(guān)。改變詞序有時會導(dǎo)致句子意義的細(xì)微變化。因此，在特定的上下文中決定是否改變某一句子的詞序時，不僅要考慮我們所要表達(dá)的意思(如為了強(qiáng)調(diào)句子中的某個成分，將正常語序中較晚出現(xiàn)的成分移到句首)，還要考慮是否有利于上下文的銜接過渡以及句子是否均衡等。
二、句式的多樣化
句式多樣化是對一篇好的文章的基本要求。要做到這一點，首先要對英語句子有充分的了解。英語句子種類很多，句法結(jié)構(gòu)豐富多彩。通?？梢园凑找韵聵?biāo)準(zhǔn)對英語句子進(jìn)行分類：
1.根據(jù)使用目的的不同，將句子分為陳述句，疑問句，祈使句和感嘆句。
(1)陳述句說明一個事實或是陳述說話人的看法。例如：
A. He must have finished his homework.
B. She is a diligent student.
(2)疑問句提出問題。例如：
A. Does she know English?
B. What did you do last night?
(3)祈使句用來表示請求，命令，叮囑，邀請，勸告等。例如：
A. Have a cup of tea.
B. Don't smoke.
(4)感嘆句表示說話時的驚訝，喜悅，氣憤等情緒。例如：
A. What an interesting film!
B. How beautiful it is!
2.根據(jù)語法結(jié)構(gòu)的不同，將句子分為簡單句，并列句，復(fù)合句以及并列復(fù)合句。
(1)如果一個句子只有一個主謂結(jié)構(gòu)，這個句子是簡單句。例如：
A. She has finished her homework.
B. Both my brother and sister are teachers.
(2)如果一個句子包含兩個或兩個以上的互不依從的主謂結(jié)構(gòu)，這個句子是并列句。并列句中的兩個或兩個以上的主謂結(jié)構(gòu)通常由逗號和并列連詞來連接。例如：
A. Honey is sweet, but the bee stings.
B. Type O is the most common blood type in the world, and type AB is the rarest.
(3)如果一個句子包含兩個或兩個以上的主謂結(jié)構(gòu)，其中一個或一個以上的主謂結(jié)構(gòu)充當(dāng)另一個主謂結(jié)構(gòu)中的某一(些)成分，如主語，賓語，定語等，該句為復(fù)合句。例如：
A. Because the luxury liner was traveling so fast, it was impossible to avoid the ghostly looking iceberg.
C. Some people say that it may result in some social problems in the future.
(4)當(dāng)一個并列句中的一個(或更多的)主謂結(jié)構(gòu)中包含有一個(或更多的)主謂結(jié)構(gòu)時，這種句子為并列復(fù)合句。例如：
A. He was watching me or something for an hour or two, drawing back the curtain so little lest I catch him, but I saw his face, and I think I can see the anxiety upon it, the worried impatience.
B. I have brought what you need, but you haven't brought what I need.