I came here for my schoolbag.这里的came为什么要用过去式?

I came here for my schoolbag.这里的came为什么要用过去式? 为什么came要变过去式 i ___(记得)they once came here for dinner. came 过去式 一般过去式：i came here last night they got here yesterday we were i came here by bike.my cousin came here by bike,too.合并为一句.i my uncle came here two years ago.同义句 my uncle ()()here for t came for 与came to的不同 Millie came third in the race.为什么要用“came”? 为什么I came to China for the second time this spring 的句子中用this before I came here,I___(have)breakfast I came here ____ to see you