英文分裂句(Cleft sentence in English)

分裂句的功能為加強語氣，又稱作強調句，將強調的部分放在主詞補語(虛主詞為it)的位置，但補語只能放名詞、形容詞、副詞(地方副詞、時間副詞、介副詞)
It+is/was+N/片語 +that...
其中，that是關係詞，引導形容詞子句修飾先行詞，若先行詞是人，也可用who(先行詞為主詞時)或whom(先行詞為受詞時)。先行詞是物、形容詞、副詞只能用that

Alex bought this table at a mall yesterday.(Alex昨天去購物中心買了桌子)
→It was Alex that/who bought this table at a mall yesterday.(強調主詞Alex)
→It was this table that Alex bought at a mall yesterday.(強調受詞this table)
→It was yesterday that Alex bought this table at a mall.(強調時間副詞yesterday)
→It was at a mall that Alex bought this table yesterday.(強調地點副詞at a mall)

要注意that子句的動詞單複數要與主詞補語一致
It is Mary that/who buys the car.(是Mary買了這部車，Mary為第三人稱單數，所以用buys)
It is Tom and Amy that/who live in this house.(是Tom和Amy住在這間房子，Tom和Amy為複數，所以用live)

參見(See also)
關係子句(Relative clause)
關係代名詞(Relative Pronoun)
複合關係代名詞(Compound relative pronoun)
關係副詞(Relative adverbs)
　關係副詞-when(Relative adverbs-when)
　關係副詞-where(Relative adverbs-where)
　關係副詞-why(Relative adverbs-why)
　關係副詞-how(Relative adverbs-how)
分裂句(Cleft sentence)