这是一个语法学家们有分歧的问题：

▲有的语法学家认为 If I were you 不能说成 If I was you。比如《朗文英语语法》在14.13.2节就认为在 If I were you / If I were in your position 中不用 was。该书所给例句为：

If I were you / in your position, I’d accept their offer. 如果我是你，我就接受他们的建议。

▲但事实上，也有的语法学家认为可以用 If I was you，比如张道真的《现代英语用法词典》在 if 词条认为：……在这类从句中be多用were形式，不管是什么人称，但现在一、三人称后用 was 的情况也不少：

Wouldn’t think a minute if I was you. (Priestley)

▲建议：如果是初学者或作为学生参加考试，建议以用 If I were you 为宜。