have changed后面加头；
例句
I have changed in every way.
我已经完完全全变了。
Things have changed quite a bit.
情况大有改观。
Times have changed and so have I.
时代变了，我也变了。
Attitudes have changed radically.
态度发生了根本的变化。
Computers have changed the way people work.
计算机改变了人的工作方式。
