you certainly did give me a surprise

就结构而言 单纯的主谓宾结构 give sb sth
certainly 跟did都属于强调作用 ,强调这件事的确发生了
it is 通常用于强调句子的某个成分 比如主语,或方式之类
eg ：it is Jim that cut class yesterday .
it is by zhoujielun’s help that.