高中英语语法I began to study English three years ago.How long did you study English last year?两句话中为什么动词都是用原形study而不是studied?

I began to wonder 高中英语语法I began to study English three years ago.How long did you study English last year?两句话中为什么动词都是用原形study而不是studied? scanf(%s,stu[i]. I began to crazy miss 几道高中英语语法选择-We're late.The play has started.-I wonder how long ago _____.A did it begin B was it beginning C it began D it has begunAccording to the periodic table ,----still some elements undiscovered.A there seem to be B it seems 状语从句 英语语法问题No sooner had I arrived home than it began to rain.为什么 had I arrived 处要用倒装 It ()five years()i began to study Englishis,began为什么 高中英语语法 I began pacing,rambling to myself. I began to faith in myself 高中英语语法练习I remembered helping a lady ( ) a lot of suitcases that day,so I wentback to( ) I had dropped her off填入相关词, I began to study English when I was seven years old.同义句I began to study English ----- ------- ------- ------seven . when this began,i had nothing to say怎样翻译 I began to learn English three years ago.是什么时态 i had hardly go home when it began to rain. I began to learn English language three years before.改错? When/While it began to rain ,I was watching TV I stopped him before he began to talk with me.