/haʊ ||; haυ/adv conj 1 (often used in questions) in what way （常用于疑问句）以什么方式，怎样: How do you spell your name? 你的名字是怎么拼的？Can you show me how to use this machine? 可以给我介绍一下这台机器的用法吗？I can't remember how to get there. 我记不得去那儿的路了。
2 used when you are asking about sb's health or feelings （用于询问健康状况或感觉）: ‘How is your mother?’ ‘She's much better, thank you.’ “你妈妈怎么样？”“好多了，谢谢你的关心。”How are you feeling today? 你今天感觉怎么样？How do you feel about your son joining the army? 你对自己的儿子参军有什么看法？
You use ‘how’ only when you are asking about a person's health. When you are asking about a person's character or appearance you say what ... like ? ‘What is your mother like? ’ ‘Well, she's much taller than me and she's got dark hair.’ 询问健康状况用how﹔询问某人的性格或外表可以用what... like﹕‘What is your mother like?'‘Well, she's much taller than me and she's got dark hair.'“你妈妈是什么样子的﹖”“好呀﹐个子比我高得多﹐长一头黑色的头发。” 3 used when you are asking about sb's opinion of a thing or a situation （用于询问对事情或情况的看法）: How was the weather? 天气怎么样？How is your meal? 那顿饭吃得如何？ How did the interview go? 面试进行得怎么样？
4 used in questions when you are asking about the degree, amount, age, etc of sb/sth （用于疑问句，询问程度、数量、年纪等）: How old are you? 你多大年纪？How much is that? 那个多少钱？
5 used for expressing surprise, pleasure, etc （表示惊讶、喜悦等）多么，何等: She's gone. How strange! 她走了。真奇怪！I can't believe how expensive it is! 那么贵，我简直无法相信。
how/what about...?→
ABOUT²
how come?→
COME(
formal 正式) used when meeting sb for the first time （初次见面时的问候语）您好
Be careful. How are you? and How do you do? are answered differently. ‘How do you do?’ is answered with the same words ‘How do you do?’ The answer to ‘How are you?’ depends on how you are feeling ‘I'm fine.’/‘Very well.’/‘Much better.’ 注意：回答How are you?跟How do you do?并不相同：对方说How do you do?就应回答说How do you do?对方说How are you?就可视乎情况而回答说I'm fine.我精神不错。／Very well.我精神很好。／Much better.我好多了。