Today is my happiest day.
Today might be the happiest day for me.
I have never been such happy before.
在于怎样的场合，英语可以很美
Today may/might be the happiest day in my life
may might:也许，might的语气稍轻一些
最开心，happiest ，最高级前面要加the
Today may be the happiest day in my life.
不一定对：Today maybe is my best/happies/pretty day
Maybe today is my happiest day!
maybe, today is my happiest day
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