5、tthenshedidliveinLondonforfouryears.3、notthat…butthat…引导两个并的原因状语从句,that相当于because,意思是“不是因为……而是因为……”。如:Ihaven'tworkedoutthemathsproblem,notthatIhavenotimeforit,butthatIcan'tworkitout.有时notthat…butthat…结构可单独出现。如:NotthatIwon'tgo,butthatIdon'tknowwhichisthewaytogo. 二、用作从属连词。 But