i can与i could的区别?

i can与i could的区别? i wish i could 和I wish i can的区别?（用法） could you can you may you will you 的区别?could i may i can i呢 what could i say与What can I say有什么区别? 英语 I could not bear it 和I can not bear it 的区别 Can I能用 could I don't 与 I can't 的区别 I hope I can 与 I hope I could 与 I hope to (宾语从句)can与could的区别 can could 有什么区别 i can`t find out which way that i should go I can't stand you 与 I can't bear you的区别是什么 How can I help you?与What can I do for you?的区别