make sure後可有三種情況：
make sure of sth： 對……確信
make sure to do sth ：壹定要做某事
make sure that+從句：意思和make sure to do壹樣，可能出現省略should的虛擬語氣用法，即直接用動詞原形。如：
To make sure that he was at home,I called him up in advance.
為了確定他在家，我事先打電話給他。
Make sure that you put down every word she says.
切實要記下她說的每壹個字。
Make sure the central heating be off.
集中供暖設備務必關掉。
Make sure you read all the small print before signing.
壹定要先看清小號字體印刷部分再簽字。