how

1 how /ˈhaʊ/ adverb
1 how
/ˈhaʊ/
adverb
Britannica Dictionary definition of HOW
1 
: in what manner or way
: by what means
2 
: for what reason : why
3 
: to what degree, extent, or amount — used before an adjective or adverb
4 
— used for emphasis before an adjective
5 
a  — used to ask if someone feels good, bad, happy, sad, etc.
— see also how do you do (below)
b  — used to ask if something is good, bad, etc.

and how

chiefly US, informal
— used for emphasis

as how

informal
: 2that

how about

1 
: does that include (someone) : what about
2 
informal
a  — used to show that you are very impressed by someone or something
b  how about that chiefly US — used to show that you are surprised or pleased by something
3 
also US (informal) how's about
a  — used to make a suggestion about what could be done
b  — used to ask someone to give you something
c  — used to ask if someone will do something
4 
— used to ask someone to tell you something in response to what you have just said

how can/could

1 
— used to show you think that someone has done or said something shocking or wrong
2 
— used to express doubt that something will happen, is possible, etc.
3 
how could you informal — used to show disappointment in someone's actions, thoughts, words, etc.

how come

chiefly US, informal
— used to ask why something has happened, is true, etc.

how dare you

— see 1dare

how do you do

formal
: hello — used especially when you are first introduced to someone

how do you like that

— used for emphasis or to show surprise or disapproval

how goes it?

— see 1go

how's everything (going)

— see everything

how so

: in what way : why do you think that

how's that (again)

informal
: what — used to request that something be repeated or explained again

how's that for

informal
— used for emphasis to describe someone or something you think is very impressive

how will/would

— used to express doubt that something will happen or is possible
2 how /ˈhaʊ/ conjunction
2 how
/ˈhaʊ/
conjunction
Britannica Dictionary definition of HOW
1 
: in what manner or way
2 
: that
3