You can use really to emphasize an adjective or adverb.
近义词
very
双语例句
例：
It was really good.
这非常好。
3.?实际上
You use really when you are discussing the real facts about something, in contrast to the ones someone wants you to believe.
双语例句
例：
My father didn't really love her.
我父亲实际上并不爱她。
4.?果真（用在疑问句和否定句中，引出否定回答）
People use really in questions and negative statements when they want you to answer 'no'.
近义词
honestly
双语例句
例：
Do you really think he would be that stupid?
你果真认为他那么蠢吗？
5.?真正地（用于强调事情的发生较以前更加常见且变得更严重）
If you refer to a time when something really begins to happen, you are emphasizing that it starts to happen at that time to a much greater extent and much more seriously than before.
双语例句
例：
That's when the pressure really started.
那是压力真正开始的时候。
6.?真的 , 其实（用在否定句中，减轻语气）
People sometimes use really to slightly reduce the force of a negative statement.
双语例句
例：
I'm not really surprised.
我其实并不惊讶。
CONVENTION. 习惯表达
1.?真的（表示惊讶或对别人的话不相信）
You can say really to express surprise or disbelief at what someone has said.
双语例句
例：
'We discovered it was totally the wrong decision.'—'Really?'