when后面为什么加过去式,如I"ll never forget the days shen we studied together

when后面为什么加过去式,如Ill never forget the days shen we studied together When I was six years old I visited the Great Wall ,为什么when后面加过去式 语法改正When I was introducing myself to Mr Sophie and asking her how she was,she ......when I was 后面的动词是加ING还是过去式. I don't know when to leave为什么when后面要加to I don't know when to leave为什么when后面要加to. when i read ,I ask he to listen to 后面为什么要加一个to When I wqs there Miss I'll tell 如题 Only I 后面的动词是加原型还是过去式? When 后面什么时候用或怎么用过去式比如这句：I wonder what goes through your mind when you hear my name.为什么不是heard?麻烦多举几例! 在过去式后面全是原型么when was she born 为什么有2个过去式 为什么过去式后面的动词还加ing. 前面用一般现在时为什么后面要加过去式呢? lend的过去式为什么后面不可以加ed啊 come up with 后面为什么可以直接加动词过去式? it was an.后面为什么加动词过去式 为什么在I'll go get my briefcase.go后面不用加to,这是一种什么用法? rather than 后面可不可以加过去式?I tried to stand on my own two feet rather than tuened to my parents为什么可以用过去式? 为什么动词过去式直接跟在主语后面?还有一般现在时也是.例：I played football.I play football.play前面为什么不用加助动词之类的词?