There are two tenses used within the invitation letter, the present and the future. The present tense conveys information about the event and the future tense ensures the guest is going to attend.

Here's How:
1. Names of party hosts or sponsoring organization.
2. Type of event (birthday party, business networking meeting, etc.).
3. Place.
4. Date.
5. Time.
6. RSVP date and phone number.
7. Any special dress requirements from black-tie to bathing suits.
8. Rain date (if any).
9. Be specific about who is invited, whether address only, with guest, or with spouse and children.

Tips:
1. Always send written invitations for formal events such as business gatherings, formal dinners, and special occasions like showers, weddings or events honoring someone.

2. If guests are not from your local area, include a map to location of event.

3. Send anywhere from 8 - 2 weeks in advance depending on formality of occasion. Weddings require the longest lead-time; casual dinners and brunches require the least.

4. Offerins invitation
->Would you like to come to the restaurant this evening?
->Will you join us?
->Would you care to have dinner with us tonight?
->Could you come to a party at my place tomorrow?
->I wander whether you would care to come on a picnic with us next week?

5. Accepting invitation
->Yes,I’d love very much.
->Thank you.
->Yes,with pleasure.

6. Reffusing
->If you don’t mind,i’d rather not.
->Thank you,i’m busy,may be next time.
->I have got another appointment.
->I’m sorry.
->I’ve lost to work to do.

EXAMPLE :
Invitation Verbal
Example:
We want to invite you to come to our house
Can you come to my restaurant?
Are you free tonight?

Accepting (menerima)
I like that
That sounds good
Thank you for inviting

Refusing(menolak)
I like that but I can’t
I’m very sorry for not able to come
Sorry, I’m very busy