make sure表示“弄確實；核實；查證”。make sure常用于祈使句，后面常接that賓語從句或of介詞短語。

1.Make sure that從句意為“弄明白；確信"。

2.Make sure of 代詞/名詞，意思也是“弄明白；確信”。例如： — Make sure of his coming before you set off. — 出發(fā)之前要確定他是否來。 — I make sure (that) he would come. — 我確信他會來。