用do/did/does 如何进行强调？在一般现在时和一般过去时可以用do/does/did进行强调。比如说：
I did tell you about it. Why do you deny it now?
我确实跟你讲过了，你现在为什么要否认呢？
I do want to have a dog like yours. How cute it is!
我真想有一只像你的狗一样的狗，太可爱了。
He does want to change his life ,so he works so hard.
他确实想改变自己的命运，所以他努力工作。