句子是表達(dá)完整意義的結(jié)構(gòu)形式，它有獨(dú)立的結(jié)構(gòu)，而不依附于其他成分，除非有特別的語(yǔ)境。一個(gè)完整的英語(yǔ)句子通常必須具備兩個(gè)基本條件：
(1)表示一個(gè)完整的意思
(2)至少包括主語(yǔ)和謂語(yǔ)兩個(gè)部分(祈使句除外)
如果將句子的某一部分(短語(yǔ)或從句)當(dāng)作一個(gè)完整的句子，如將從句、同位語(yǔ)、短語(yǔ)當(dāng)作句子，或者將現(xiàn)在分詞、過去分詞、動(dòng)名詞、不定式當(dāng)作謂語(yǔ)，或者句中缺少主語(yǔ)或謂語(yǔ)就會(huì)導(dǎo)致非完整句。試比較：
不完整：While they always try to avoid the number of 4 for its connection with death in pronunciation.
完整：However,they always try to avoid the number of 4 for its connection with death in pronunciation.
不完整：How to write a composition.
完整：How to write a composition is not an easy thing to talk about.
不完整：If the weather were fine.
完整：If it were fine,we would have a good time.
(1)表示一個(gè)完整的意思
(2)至少包括主語(yǔ)和謂語(yǔ)兩個(gè)部分(祈使句除外)
如果將句子的某一部分(短語(yǔ)或從句)當(dāng)作一個(gè)完整的句子，如將從句、同位語(yǔ)、短語(yǔ)當(dāng)作句子，或者將現(xiàn)在分詞、過去分詞、動(dòng)名詞、不定式當(dāng)作謂語(yǔ)，或者句中缺少主語(yǔ)或謂語(yǔ)就會(huì)導(dǎo)致非完整句。試比較：
不完整：While they always try to avoid the number of 4 for its connection with death in pronunciation.
完整：However,they always try to avoid the number of 4 for its connection with death in pronunciation.
不完整：How to write a composition.
完整：How to write a composition is not an easy thing to talk about.
不完整：If the weather were fine.
完整：If it were fine,we would have a good time.