I have been there( )three times.括号里加for吗

I have been there( )three times.括号里加for吗 i have been there (for) three times.这句话中括号中的for一定要加吗? 对划线部分提问 I have been there three times（three times划线） i have been there （for） four times.这句话中括号里的for要加吗?可不可以不加? I have been asking the same question for three times from yo I'have been to harbin three times(画线提问） i have been to the west lake three times ---1970 I have been to America three times 的被动语态 I have been to England three times（对划线部分提问）three times划线 I have been to Beijing three times与I have been to Beijing fo Have you ever been toShanghai,Mary?Yes,I ___ there for three I have been there for three days with my parents last month.