if i studied harder和 if i had studied harder 语义上有何差别

if i studied harder和 if i had studied harder 语义上有何差别 If i had studied Father promised that if I studied harder he would take me to 英语语法题（高中）How I wish i had studied harder when i was in senio 英语选择,请分析How I wish I had studied harder when I was in school If Tom have studied harder before,he____(pass)the examinatio -How I wish I had studied harder when Iwas in senior shool!- if he studied harder中为什么要用studied而不是studys 高中英语改错每句中都有一处错误1.If she studied harder,she would have passed I do not know what I should do.（同义句） He studied harder so th If I had worked harder at school,I -----in a comfortable off 一道英语虚拟语气的题If I had worked harder at school,I___________in a