if怎么用，and

1、What I did was right and if I had done anything less it would have been wrong.我做的一切都是正确的，如果我少做了一点点，就会出错。

2、I don't really get a lot of information， and if I do I get it off Mark.我得到的信息其实不多，即使有也是马克告诉我的。

3、He could react rather jealously when and if another child comes on the scene.如果别的孩子也加入其中，他可能会表现得相当嫉妒。