INVITATION (WRITTEN)

To invite someone :

* I would like you to …

* We would be pleased if you could …

* Would you like to …?

* Shall we …?

* How about …?

To accept an invitation

* Thank you. Yes, I would like to …

* Yes, I would. Thanks.

* That would be very nice. Thank you.

* All right!

* O.K.!

To refuse/decline an invitation

* I would love to, but …

* That’s nice/great. Unfortunately/However …

* That’s very kind of you, but …

* Sorry, that wouldn’t be possible. Thanks anyway.