Your friend invited you to a picnic which you enjoyed very much. White him a postcard where you: express your gratitude for the invitation, praise his mother's food, praise their hospitality, express your pleasure of having great fun.

Hello Joe!

How is you doing? I'm rellay glad that you are invited me. That was really cool picnic this sunday! I've enjoyed it very much! Your mother's food was gerat and your hospitality was perfect! I also enjoyed having fun when we are decided to play some footbal after this. Dont you want to repeat this in the next holidays? we can meet near my house and have some fun too!

Write back soon.

Kevin