看语境。 例如, I've shown you my point. it’s not what you look at that matters. it’s what you see. ---这显然不是强调句,因为it指my point。尽管不强调,通过对照,语气已经很强了。 you must have a better understanding. it’s not what you look at that matters. it’s what you see. 这里,it不可能指上句的a better understanding,只能是强调句。