Question

5．自從我十五歲后，就習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)合句意表示習慣于做某事用be used to doing sth，動作發(fā)生在過去并持續(xù)了一段時間，故用現(xiàn)在完成時have/has+過去分詞，主語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．

點評 used to do 過去常常做某事 
be used to doing 習慣于做某事 be used to do sth被用來做某事