Asking for clarification/saying you don’t understand
“Sorry, I didn’t hear. Please can you repeat that?” “Sorry, I don’t understand what you mean. Please can you explain?”
Everyday English
Asking for directions
“Excuse me, can you tell me how to get to…?” “Excuse me, do you know how to find…?”
Declining an invite/saying you can’t attend
“I’m afraid I won’t be able to make it.” “I’m sorry, I’m unable to attend.”
Saying you don’t know
“I’m not sure.” “I have no idea.”
Ending a conversation politely
“It was good talking to you.” “I should get going.”