比如说I am playing football. 和I playing fottball .哪个对 为什么我老师说形容词和名词后面要加be动词对吗?那么哪些是不用加be的?

I'am playing for I'am playing for I am（）.playing football playing the football play football I am playing football （对 playing football 提问） i am always playing 和 i always am playing那个对 I am no playing computer .改病句可不可以 I am playing computer . 比如说I am playing football. 和I playing fottball .哪个对 为什么我老师说形容词和名词后面要加be动词对吗?那么哪些是不用加be的? i am going to musunm on foot.改为一般疑问句 改错 What size are your foot?I am Size Eight. Because my right foot hurt.I am sorry() on foot和walk这样用对吗?i'am go to school on foot.i'am walk to school. I am going to take a trip in the country on foot.用on foot提问. i am getting some soy sauce,i am doing push-ups,i am playing hidden i am playing tennis and singing.和i am singing as i playing tennis.谁更好?有语法错误吗? I am practicing playing the violin.有语病吗? I am playing the violin.改成一般疑问句 I am playing the violin.改成一般疑问句? I am playing the violin改成一般疑问句 英语翻译I am not interested in playing games _ _ .