first let's look at some basic sentences 我们先来看一下基本句型

How about going with us ?

Would you like to join us ?

I'd like to invite you to the party.

How about going with us ? 和 Would you like to join us ? 比 I'd like to invite you to the party. 要稍微不正式点.

Are you free on Sunday ?

Why don't come and join us for a dance ?

Thanks,I'd like to.

回答别人的邀请时,如果你想去,想接受别人的邀请可以说I'd like to.

It's so nice of you,thanks a lot.

That's a good ideal.

Oh,I'm afraid I can not to go tonight,perhaps tomorrow everning ?

I'm sorry i can't,but thank you anyway.

拒绝别人的邀请时,最好说I'm sorry i can't.而且同时感谢对方的邀请.thank you anyway.

Let's try some scene dialogue.

我们来看一下场景对话

How about having a cup of tea with us?

All right,that's very nice of you.

Would you like to go to the cinema with me?

Oh,I'm sorry i can't Mark.thank anyhow.

Hello,this's Susan.

Hello,I'm Mark.i'm just wounder if you are free this weekend?

Yes,I think so.

Good,I'm thinking i'd like to invite you to watch movie.I can meet you at the cinema gate.

what's the time ?

6:30 tonight.

Oh,I'm sorry i can't,because i have to do some housework.you can ask Jenny to go wiht you.

All right,maybe next time i can go with you.bye

Goodbye!