Grammar Point
adverb (fukushi)
adv 
word usually written using kana alone
uk 
どう

how, in what way, how about

どう + Verb

Used as an interrogative adverb to ask about the current state, condition, or nature of a person or thing. It is often used to ask for someone's opinion or to check on a situation.

どう + です / でした

Asking about the state, quality, or impression of a noun.

How is the tea?

How was the trip?

どう + Action Verb

Asking about the method or manner in which an action is performed.

How do you use this?

How do you write that kanji?

Note

どう is the informal version of いかが. When used to ask about a state or condition, it is frequently paired with the verb です. To ask for a specific method or way of doing something, it is paired with action verbs.

どう + した / して

Used to ask about the reason or cause of a situation, or to ask what happened when something seems wrong.

どう + した

Asking about a change in state or a problem.

What happened?

What is wrong with your leg?

Note

どうした is commonly used to mean 'What's the matter?' or 'What happened?'. どうして is used to ask 'Why?' or 'How come?'.

Words: 
如何どう
Radicals of radicals