首先，主句是一般现在时，宾语从句可以是任何时态，不限于一般现在时。
第二，如果宾语从句要用一般现在时，那么要看从句的主语，如果从句的主语是第三人称单数，那么从句的动词就要加s。
He says (that) he falls down.
He says (that) he will fall down.
He says (that) he fell down.
He believes (that) she loves him.
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