加不加for His father has been to America 【for】 five times.他父亲去过

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加不加for
His father has been to America 【for】 five times.
他父亲去过美国5次
我觉得是不加吧?once,twice 记得是不加的,这还要加么?
once twice 前不加for ,之类的介词是为什么啊。

在表示频率的名词短语前通常不加介词.
例如：We have meals three times a day.
而once twice更是副词,没有理由用for.for是介词,后面要加宾语~而副词是不可能充当宾语的.
表示频率的词组也是作为状语来修饰谓语,不必用介词短语.

his father has been to America twice has been to the zoo for five times 和My mom has been to Beiji My father has been to England five times. His father has been to America twice 对twice提问 his father has been to America twice 对twice 提问 Ben has been to Singapore five times. His father has been away from Beijing for a week. He has been to Beijing for three times 这里的for three times 是状 His father has been dead for two years为什么用been?been不是表被动吗? His grandfather has been dead for about five years.(同义句） His he has been to China four times还是for four times 他父亲一周后抵达美国.His father ( ) ( ) to America ( ) a week.