Everything:用与肯定句、疑问句中。Anything:用于否定句和疑问句中。Something:用于用与肯定句和疑问句中。但在用 Would 提问时,要用Something,而不能用 Anything. Eg: Would you like something to eat ?
everything用于肯定、疑问、否定anything用于否定、疑问something用于肯定、和询求意见的疑问句中
anything用于疑问句和否定句