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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
?
连接副词：when; where; why; how等。
在句中担任状语
if或whether连接的宾语从句，由一般疑问句转化而来，常放在ask，see，know，wonder, find out等动词/组后面。常可换用,口语中多用if。
The old woman asked me if I knew the way to the hospital.
— Is Peter there?
— Hold on, please. I’ll see if I can find him for you.
Nobody knows whether/if it will rain tomorrow.