She drew her travel memories on a picture postcard.

She sent me a picture postcard while she was traveling.

Your new dress is really splendid, isn't it?

I sent a postcard to my friend.

I will send you a postcard.

They (referring to women or girls) are my best friends.

I decided to send a reply to my friend using a postcard with a reply card attached.

I sent you a postcard.