11.if I were you(用于提出建议时)如果我是你
What I'd do if I were you is be nice to him.如果我是你, 我要做的就是对他好。
I should lie down for a bit, if I were you.如果我是你, 我就躺一会儿。
12.if not
(introducing a qualification)(用于对之前所说的话进行具体说明或使其语气弱化)即便不, 纵然不, 虽然不
I will be ready in a couple of weeks, if not sooner.就算不能更快, 几周以后我也会准备好。
(although not)(用于单词或短语之前, 表示所言不适用于此, 而适用于同时提到的与其紧密联系的某事)要是不, 即使不
She understood his meaning, if not his words, and took his advice.她即便没听懂他的话, 也明白了他的意思, 并且接受了他的建议。
13.if only
(expressing a wish)要是…多好
If only it were that simple!要是那么简单就好了！
If only I had more money!要是我有更多的钱就好了！
(giving a reason)即使仅仅为了(或因为)
A one-to-one meeting with the U.S. President was necessary, if only for a deeper exchange of views.与美国总统一对一的会谈是必要的, 即便仅仅是为了双方观点更深入的交流。