优质解答
3.(1)Did go didnot
(2)will do will-piant will piant
(3)are doing are-singing dancing are singing are-singing
（4）Did go didnot Did go didnot-go helped
(5)Does go does does shop
(6)came Did have leaved
3.(1)Did go didnot
(2)will do will-piant will piant
(3)are doing are-singing dancing are singing are-singing
（4）Did go didnot Did go didnot-go helped
(5)Does go does does shop
(6)came Did have leaved