I could __understand what this book talk about A usually B formely C scarcely D virtually

I could __understand what this book talk about A usually B formely C scarcely D virtually I wish I could. I hope I could so could I neither could I nor I could 意思so could I neither could I nor I could So Happy I Could wish I could wish I could Could I---------Mike,please? I could是什么时态 wish i could 歌词 could I have your? I could not bear I could not catch i could ask you What could I would if i could. Could I share with IF I COULD TELL