what are you doing?I am washing the dishes.第一句话为什么要用are?不是说表示复数的时候才用的吗 You是复数吗?

What are you doing?I missing you! i know who you are,but what are you doing what are you doing? What are you doing? what are you doing What are you doing? WHAT ARE YOU DOING? what are you doing? “What are you doing now?I miss see you! hey ...What are you doing?I want to sleep.. what are you doing? I am (只是)having lunch. what are you doing?I ____(do)my homework. 填空What are you doing?I'm()()my keys. What are you doing?I'm looking ___my pencil. What are you doing?I'm playing violin.（改错） What are you doing?I`m washing the __(dish) I am playing house.What are you doing? what are you doing?I am__basketball.A play B playing