“Yours faithfully”, “Yours sincerely”

“Get in touch with…”

”but”

“I am sorry to inform you that…”

refers to reason for writing

“I look forward to receiving your reply”.

simple linkers, e.g. then, later, so

“I am very grateful for…”

polite phrases

“Why don’t we…”

“Yours”, “Best wishes”, “Write soon”

contracted verb forms

P.S.

phrasal verbs; idioms and slang

”nevertheless”, “therefore”

“Everything is OK.”