because和because of

because和because of 

because是连词，其后接原因状语从句或回答以why开头的问句； 

而because of是复合介词，其后接名词、代词或动名词，或者what引导的名词性从句。 

如 

(1)___he is ill,he is absent today. 

(2)He is not at school___his illness. 

(3)He can”t come___the heavy rain. 

(4)We like physics___we can learn a lot 
of ideas. 

答案：1.Because 2-3.because of 4.because