Ex9
1. (+) am doing
(-) I am not doing ...
(?) Are you doing...?
Yes, I am/ No, I am not
2. (+) is making
(-) ...isn't making...
(?) Is Tim making...?
Yes, he is/ No, he isn't
3. (+) is writing
(-) ...isn't writing...
(?) Is Mai writing...?
Yes, she is/ No, she isn't
4. (+) are painting
(-) ...aren't painting...
(?) Are Lan and Ba painting...?
Yes, they are/ No, they aren't
5. (+) are playing
(-) ...aren't playing
(?) Are the boys playing...?
Yes, they are/ No, they aren't
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