ln groups, make a calendar showing all your classmates birtdays.Present it to the class Maria and Pete's birthday are on... .

Short answer: Use your classmates’ real dates. A model sentence is:

Maria and Pete’s birthdays are on the fifth of May and the twelfth of September.

If you use numbers, write: “... on 5 May and 12 September” (British style) or “... on May 5th and September 12th” (American style).

How to do it

1. Make a calendar or chart with the twelve months.
2. Put each classmate’s name under their birthday date.
3. For one person, use:

   Anna’s birthday is on 3 March.

4. For two or more people, use plural birthdays and are:

   Maria and Pete’s birthdays are on 5 May and 12 September.

5. In your presentation, say:

   This is our class birthday calendar. In January, ... In February, ...
   Maria’s birthday is on ... and Pete’s birthday is on ...

Check: say on a date, not “in”; use birthdays are when there are two birthdays.