I think he is on duty today.为什么用ON,可以去掉吗

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• I think he is on duty today.为什么用ON,可以去掉吗
• 1.定语从句可以修饰疑问代词吗?（注意是“修饰”不是“引导”,是“疑问代词”不是“关系代词”）2.如：“What he said is true”中的主语从句“what he said”可以理解为“what”作主语,“he said”作定语从句修饰主语“what”吗?3.如果可以,那么“He think over what I said”是一个错误的句子吗?因为“what I said”可以理解为一个被定语从句修饰的疑问代词,而代词是要放在动词与副词（小品词）之间的,即“He think what I said over”才正确.但我们也可将“what I said”看作“ think over ”的宾语从句,这不是矛盾了吗?4.此问题我搜过许多遍都未发现明确答案,1.“what”可以引导宾语从句，不能引导定语从句，但“what”能否被定语从句修饰，即“what”能否作为定语从句的先行词？2.另外，顺便问一下“what”为什么不能引导定语从句（即作为定语从句的关系词）呢？
• 提问,英语的一些单词、短语、句型用法1、We are all here waiting for Miss Green to come 为什么用to come2、I saw a big dog lying under the tree when walking past the shop为什么不用was walking3、All has been done now.We can go.这里为什么用has?是All为不定代词还是将All看为一个整体还是什么?4、The students were all tired,but none of them stopped to have a rest-Do you want an apple,a banana or a pear?-None,they all look bad为什么用none,不是人和物吗?5、I think he must be in the office now,isn't he?是否情态动词反意疑问句都用be动词?
• I think that doing lots of listening ,that 后面为什么用动词的ing形式?为什么用that ,可以去掉吗?
• “宾语从句主语为第一人称I或we 时,反义疑问句与从句保持一致”这话是不是不完整?我认为应该是：只有“I/we (don't) think/believe/suppose/expect + 宾语从句”这类存在否定转移可能性的复合句,其反意疑问句才是对后面的宾语从句进行相应变化.问：1.哪一句话对? 第一句对还是我的对 2.We find that he never listens to the teacher carefully,does he ? 这句子为什么... 难道find 也算可以否定转移的词吗
• I think he is on duty today.为什么用ON,可以去掉吗
• I'm on duty Today .first of all ,let's play a game
• 为什么-（ ）is on duty today?-I am.