When: whenever you want to criticize something.
何时：每当你想批评事情的时候。
Step1: 第一步
First decide what you are going to give as a positive alternative to it.
先决定你会给出什么积极的选择、方案。
Step 2: 第二步
If you don't have an alternative, wait. Then criticism is not to be done because it is futile. First decide about the positive program and then, keeping an eye on the positive program, criticize. Then your criticism will be very valuable.
如果你没有选择可以提供，就等待。不然就不要批评，因为光批评没用。先决定好积极方案，然后想着这个积极方案，同时加以批评。那么你的批评就会非常有价值。