Subject + 怎么 + Verb
The interrogative word 怎么 (zěnme) means 'how' or 'what to do' and is one of the most frequently used question words in Chinese. It is placed before a verb to ask about the manner or method of an action, and can also express surprise or disbelief in rhetorical questions.
这道题我不会做,你能告诉我怎么做吗?
zhè dào tí wǒ bù huì zuò, nǐ néng gàosù wǒ zěnme zuò ma?
I don't know how to solve this problem — can you tell me how?
你怎么现在才来?我们等你好久了。
nǐ zěnme xiànzài cái lái? wǒmen děng nǐ hǎo jiǔ le.
Why are you only coming now? We've been waiting for you for a long time.
这个软件怎么用?我刚下载的。
zhège ruǎnjiàn zěnme yòng? wǒ gāng xiàzài de.
How do you use this software? I just downloaded it.