Making invitations發出邀請：
"Do you have any plan next Friday night? We are having some friends over for a dinner party. Would you like to join us?"
Or "Are you free next Friday night?"
Or "Are you doing anything Friday night?"
"Would you be interested in coming to our house that night?"
"How do you like to join our part Friday night"

Accepting invitations接受邀請：
Someone asks: "Would you like to..."
You: "I'd love to, thank you." or "That's very kind of you, thanks." or "It sounds great, thank you." or "That will be lovely, thank you."
Someone asks: "Do you like to going to the movie theater with us this afternoon?"
"What's great, thank you." or "What a good idea, thank you."

Declining invitations拒絕邀請：
"Would you like to spend a weekend at our house next week?"
"That's very kind of you, but actually I'm planning to see my mother next Saturday.
"Well, I'd love to, but I already told my girlfriend to stay at her place next weekend."
"I'm really sorry, but I got to do something else on next weekend."
"I really don't think I can make it - I am supposed to be at airport pick up my girl friend next Sunday morning."

Remember:
當你拒絕他人的邀請時，要特別注意禮貌。通常你要給個理由，說明為什么無法接受邀請。或者道歉。