现在进行时：（把所给的句子变成：肯定句,否定句,一般疑问句,肯定回答,否定回答.感激不尽!

we are having an English classes now。we aren't having an English classes now。Are we having an English classes now?Yes,we are。No,we aren't。They are playing football。They aren't playing football。Are they playing football?Yes,they are。No,they aren't。My sister is teaching me to piay the piano。My sister isn't teaching me to piay the piano。Is my sister teaching me to piay the piano?Yes,she is。No,she isn't。He is walking to school now。He isn't walking to school now。Is he walking to school now?Yes,he is。No,he isn't。My mother is washing clothes。My mother isn't washing clothes。Is my mother is washing clothes?Yes,she is。No,she isn't。They are doing homework。They aren't doing homework。Are they doing homework?Yes,they are。No,they aren't。They are having a party this moring。They aren't having a party this moring。Are they having a party this moring?Yes,they are。No,they aren't。I'm going out this evening。I'm not going out this evening。Am I going out this evening?Yes,I am。No,I'm not。They are playing games。They aren't playing games。Are they playing games?Yes,they are。No,they aren't。The childen are iying a kite in the park。The childen aren't fiying a kite in the park。Are the childen fiying a kite in the park?Yes,they are。No,they aren't。