You use how to emphasize the degree to which something is true.
I didn't realize how heavy that bag was going to be.
我没有想到那个包会有多重。
You use how in exclamations to emphasize an adjective, adverb, or statement.
How strange that something so simple as a walk on the beach could suddenly mean so much.
在海滩上散步这么简单的事突然间变得意义如此重大,真是奇怪。
You use how to describe the way in which something happens or is done.
I don't want to know how he died.
我不想知道他是如何死的。
You use how after certain adjectives and verbs to introduce a statement or fact, often something that you remember or expect other people to know about.
It's amazing how people collect so much stuff over the years.
人们这些年下来竟能收集到这么多东西,真令人惊奇。
It's funny how I never seem to get a thing done on my day off.
好笑的是,我好像从没在休息日里做成过一件事。
If you ask someone 'How about you?', you are asking them what they think or want.
Well, I enjoyed that. How about you two?
嗯,我很喜欢那个。你俩觉得呢?
how come , how so
You ask 'How come?' or 'How so?' when you are surprised by something and are asking why it happened or was said.
'They don't say a single word to each other.'—'How come?'
“他们相互不说一句话。” “怎么会这样?”
how about
You use how about to introduce a new subject which you think is relevant to the conversation you have been having.
Are your products and services competitive? How about marketing?
你们的产品和服务具有竞争力吗?营销怎么样?
You use how to ask about the way in which something happens or is done.
How do I make payments into my account?
我怎样付款到我的账户呢?
How do you manage to keep the place so neat?
你是怎么把这个地方保持得如此整洁的呢?
You use how to ask questions about the quantity or degree of something.
How much money are we talking about?
我们所说的这笔钱有多大数目?
How many full-time staff have we got?
我们有多少全职员工?
How long will you be staying?
你要呆多长时间?
How old is your son now?
现在你儿子有多大?
You use how when you are asking someone whether something was successful or enjoyable.
How was your trip down to Orlando?
你的奥兰多之旅怎么样?
How did your date go?
你的约会怎么样?
You use how to ask about someone's health or to find out someone's news.
Hi! How are you doing?
你好!最近怎么样?
How's Rosie?
罗茜身体好吗?
You use how in expressions such as 'How can you...' and 'How could you...' to indicate that you disapprove of what someone has done or that you find it hard to believe.
How can you drink so much beer, Luke?
卢克,你怎么可以喝这么多啤酒?
You use how in expressions such as 'How about...' or 'How would you like...' when you are making an offer or a suggestion.
How about a cup of coffee?
来杯咖啡怎么样?