Grammar: Formal vs informal English

ask (informal) → inquire (formal)

to request information

help (informal) → assist (formal)

to support or aid

get (informal) → receive (formal)

to obtain something

buy (informal) → purchase (formal)

to pay for something

need (informal) → require (formal)

to need something officially

find out (informal) → discover / ascertain (formal)

to learn information

deal with (informal) → handle (formal)

to manage a situation

tell (informal) → inform (formal)

to give information

say sorry (informal) → apologize (formal)

to express regret

thanks (informal) → thank you (formal)

expression of gratitude

bye (informal) → goodbye (formal)

a way to end a conversation

Can you…? (informal) → Could you…? (more polite/formal)

asking for something

I want… (informal) → I would like… (formal)

expressing желания

Give me… (informal) → Could you please provide… (formal)

polite request

Send me… (informal) → I would appreciate it if you could send… (formal)

very polite request

so (informal) → therefore (formal)

showing result

but (informal) → however (formal)

contrast

also (informal) → in addition (formal)

adding information

then (informal) → subsequently (formal)

next step

anyway (informal) → nevertheless (formal)

despite that