Question

5．自從我十五歲后，就習(xí)慣于幫著母親做家務(wù)事．
Ihave been used to helping my mother do the housework since I was fifteen．

Answer 1

分析 have been used to helping my mother do．

解答 答案：have been used to helping my mother do．結(jié)合句意表示習(xí)慣于做某事用be used to doing sth，動(dòng)作發(fā)生在過去并持續(xù)了一段時(shí)間，故用現(xiàn)在完成時(shí)have/has+過去分詞，主語(yǔ)I，故have，be的過去分詞been，幫助某人做某事help sb do sth，故答案是have been used to helping my mother do．

點(diǎn)評(píng) used to do 過去常常做某事 
be used to doing 習(xí)慣于做某事 be used to do sth被用來做某事