American people like to say "Thank you" when others help them or say something kind to them. People in many countries do so, too. It is a very good habit.

    You should say "Thank you" when someone passes you the salt on the table,  when someone walking ahead of you keeps the door open for you, when someone says you have done your work well, or you have bought a nice thing, or your city is very beautiful. "Thank you" is used not only between friends, but also between parents and children, brothers and sisters.

    "Excuse me" is another short sentence they use. When you hear someone say so behind you, you know that someone wants to walk past you without touching you. It's not polite to break others when they are talking. If you want to speak to one of them, say "Excuse me" first, and then begin talking. You should also do so when you begin to cough or make any noise before others.

    Let's learn to say "Thank you" and "Excuse me".

    My father is tall and has short, gray(灰白的) hair. He wears glasses with heavy, black frames（框架）. But I just see a picture of him from 1968. What a surprise! In the picture, he's 15 years old. He's short and he has glasses with small, round frames. He has long, yellow hair and it's really straight. He's wearing blue jeans and a T-shirt with the word "Love". I'm 15 years old now. I'm medium height and I have short hair. My hair isn't yellow, it's blue. My dad thinks it's strange(奇怪的), but my friends think it's great. I wear glasses, but my glasses have bright red frames. They're so cool! I have an earring(耳环) in one ear, too. Dad really can't understand(明白) that, I never wear blue jeans. I like big, baggy(松的) pants and long T-shirts. Most of my T-shirts have pictures of my favorite rock bands(摇滚乐队) on them.

that man a doctor.

does your uncle ？