It is...that...是强调句的标志,
判断一个句子是不是强调句,把It is that 抽调别的成分不变语序,仍然是一个语意完整的句子,则原句是强调句
这一个抽调后是so dark int the cinema I could hardly pick out my friend.很显然翻不通,因而不是强调句
It is you that help me.抽调后是you help me你帮了我,语意完整,因而是强调句