“while” 和 “meanwhile”都表示「同時發生」，但他們有什麼區別嗎？
I went to a concert. Meanwhile, my friend was at a restaurant. （2句）
I will do my homework while you watch TV. （1句）
I went to a concert. Meanwhile, my friend was at a restaurant. （第二句句首）
While you watch TV, I will do my homework. （句首）
I will do my homework while you watch TV. （句中）
Mom worked all day. Meanwhile, I was at school. （逗號緊跟在後）
While you sang, I took pictures of you. （沒有逗號）
Mom worked all day. Meanwhile, I was at school. （加主語）
While you sang, I took pictures of you. （加主語）
Every day, I eat breakfast while reading the newspaper. （加動詞ing形式）
1）People were at home watching TV. _____, aliens were planning their invasions of the Earth.
2）_____ I was waiting for Jeremy, I heard a loud noise.
3）I read a lot of books _____ I was on the airplane.
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