兩個(gè)或兩個(gè)以上簡(jiǎn)單句（Simple Sentence）可以合成一個(gè)較長(zhǎng)的簡(jiǎn)單句、并列句（Compound Sentence）或復(fù)雜句（Complex Sentence）。通過句子的合成，我們得以更清楚地看出句子間的語義關(guān)系，而且還可以使句子多樣化，增加文章的豐姿。
現(xiàn)在就從三方面來看看句子合成法的問題。
1. 由兩三個(gè)簡(jiǎn)單句合成一個(gè)長(zhǎng)的簡(jiǎn)單句。例如：
（1） John ran away. He escaped the danger.
→ Running away, John escaped the danger.
（2） The hunter took up his gun. He shot the boar.
→ The hunter took up his gun to shoot the boar.
（3） The king died. The queen heard about it. She fainted.
→ On hearing about the king's death, the queen fainted.
（4） Kelvin is my good friend. He is a strong supporter of social justice.
→ Kelvin, a strong supporter of social justice, is my good friend.
（5） The rascal kicked the cat. He kicked it on the back. He kicked it intentionally.
→ The rascal kicked the cat on the back intentionally.
2. 由兩三個(gè)簡(jiǎn)單句合成一個(gè)并列句。例如：
（6） John was sad. He kept quiet.
→ John was sad but he kept quiet.
（7） Take the book. Leave it there.
→ Take the book or leave it there.
（8） Sean did not come to class today. He had a bad headache.
→ Sean did not come to class today, for he had a bad headache.
（9） Bruce was lying on the bed. He looked at the ceiling. He saw a lizard.
→ Lying on the bed, Bruce looked at the ceiling and saw a lizard.
3. 由兩三個(gè)簡(jiǎn)單句合成一個(gè)復(fù)雜句。例如：
（10） Kelvin is getting rich. We know about it.
→ We know that kelvin is getting rich.
（11） I like this book. It contains many amusing stories.
→ I like this book which contains many amusing stories.
（12） Helen is sure to get her pay. It is due to her. Why does she complain?
→ Why does Helen complain since she is sure to get the pay due to her ?
（13） The woman was exhausted. She had not slept well the previous night.
→ The woman was exhausted because she had not slept well the previous night.
上面例子顯示，簡(jiǎn)單句由“主語+謂語”（Subject + Predicate） 構(gòu)成，有時(shí)還附有修飾性的短語。并列句由至少兩個(gè)地位平等的并列分句透過并列連詞 （Coordinating Conjunction）如“and, or, but, so, for”等連成。復(fù)雜句包括一個(gè)主句 （Main Clause）及至少一個(gè)從句 （Subordinate Clause）， 通過從屬連詞（Subordinating Conjunction） 如“That, since, because, when, if”等合成。從屬分句因功能不同而分成“名詞從句”（Noun Clause）, “副詞從句”（Adverb Clause） 和“形容詞從句”（Adjective Clause）。
上述諸句式中，復(fù)雜句最為多采多姿，不妨多用。為了避免句子太長(zhǎng)，難以控制，一個(gè)復(fù)雜句不要超過三個(gè)從句。
現(xiàn)在就從三方面來看看句子合成法的問題。
1. 由兩三個(gè)簡(jiǎn)單句合成一個(gè)長(zhǎng)的簡(jiǎn)單句。例如：
（1） John ran away. He escaped the danger.
→ Running away, John escaped the danger.
（2） The hunter took up his gun. He shot the boar.
→ The hunter took up his gun to shoot the boar.
（3） The king died. The queen heard about it. She fainted.
→ On hearing about the king's death, the queen fainted.
（4） Kelvin is my good friend. He is a strong supporter of social justice.
→ Kelvin, a strong supporter of social justice, is my good friend.
（5） The rascal kicked the cat. He kicked it on the back. He kicked it intentionally.
→ The rascal kicked the cat on the back intentionally.
2. 由兩三個(gè)簡(jiǎn)單句合成一個(gè)并列句。例如：
（6） John was sad. He kept quiet.
→ John was sad but he kept quiet.
（7） Take the book. Leave it there.
→ Take the book or leave it there.
（8） Sean did not come to class today. He had a bad headache.
→ Sean did not come to class today, for he had a bad headache.
（9） Bruce was lying on the bed. He looked at the ceiling. He saw a lizard.
→ Lying on the bed, Bruce looked at the ceiling and saw a lizard.
3. 由兩三個(gè)簡(jiǎn)單句合成一個(gè)復(fù)雜句。例如：
（10） Kelvin is getting rich. We know about it.
→ We know that kelvin is getting rich.
（11） I like this book. It contains many amusing stories.
→ I like this book which contains many amusing stories.
（12） Helen is sure to get her pay. It is due to her. Why does she complain?
→ Why does Helen complain since she is sure to get the pay due to her ?
（13） The woman was exhausted. She had not slept well the previous night.
→ The woman was exhausted because she had not slept well the previous night.
上面例子顯示，簡(jiǎn)單句由“主語+謂語”（Subject + Predicate） 構(gòu)成，有時(shí)還附有修飾性的短語。并列句由至少兩個(gè)地位平等的并列分句透過并列連詞 （Coordinating Conjunction）如“and, or, but, so, for”等連成。復(fù)雜句包括一個(gè)主句 （Main Clause）及至少一個(gè)從句 （Subordinate Clause）， 通過從屬連詞（Subordinating Conjunction） 如“That, since, because, when, if”等合成。從屬分句因功能不同而分成“名詞從句”（Noun Clause）, “副詞從句”（Adverb Clause） 和“形容詞從句”（Adjective Clause）。
上述諸句式中，復(fù)雜句最為多采多姿，不妨多用。為了避免句子太長(zhǎng)，難以控制，一個(gè)復(fù)雜句不要超過三個(gè)從句。