i'm learning chinese as well so i don't know how good my answer will be, but from what i know it means to play and is used in like a "hanging out and having fun" sort of sense :)

1) I'm going to pick up my parents at the airport. (you would use "at" for all the examples) 2) I think saying "picking up" the baby might sound weird. People would say "carry" the baby more often, I think. Unless you're using it in the same way as #1, where you're picking up the baby from day care or something!

Yup, it's very common to have parties on our birthdays! Usually (if you aren't an adult yet) your parents pay for the party. It can be anything! It could be a fancy dinner with your friends, a dance party, a party at the beach... whatever you want! Usually your friends all bring presents and you celebrate by eating cake :D Also sometimes friends will throw you a surprise party! If you weren't planning on having a party they may set one up without you knowing and surprise you with one, it's so cool omg

Hello everyone!

Hello everyone. I 'm Aoi. I'm a Japanese. I'm studying English so please teach me a lot of English a lot!!

(good luck on your learning! i believe in you!!)