It is today that is your birthday是正确的
他的意思是今天是你的生日,其中强调今天强调你的生日怎么说呢It is your birthday that is today.强调生日 是你的怎么说呢 谢谢这种强调句型是不可以强调定语、动词和表语，所以 不能强调Your这个词只能强调主语和宾语么还可以强调状语，例如Today I don't do my homework => It's today that I don't do my homework.