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Step 2 Grammar
We use a question word to introduce an object clause that expresses a wh- question. The word order in the clause should be the same as that in a statement.
Tip: Whom is an object pronoun. We can use who instead of whom.
1. I wonder what I should do.
2. Daniel does not know whom he should talk to.
3. Sometimes we forget when we should stop.
4. I do not understand why they are so strict with me.
5. I do not know how I should deal with the problem.
Step 3 Object clauses.
从句来源
连接词
备注
陈述句
that
口语或非正式文体中常省略
一般疑问句
if / whether
?
特殊疑问句
连接代词：who; whom; whose; which; what 等
在句中担任主、宾、定或表语。
?
连接副词：when; where; why; how等
在句中担任状语
连接代词和连接副词有词义，并且在句中充当句子成分。
e.g. Can you tell us what they are doing?
what在从句中作宾语，意思是“什么”。
宾语从句的语序必须是陈述语序。
e.g. She wants to know why that little boy is crying.
宾语从句中的连接代词who与whom都指人，意思是“谁”。其中who为主格，在从句中作主语；whom为宾格，在从句中作宾语。