tom,_____(not walk)on the grass the geese____(catch) the fish now

tom,_____(not walk)on the grass the geese____(catch) the fish now

do not walk 意思是：Tom,不要走在草地上.（Tom,不要践踏草坪）,否定祈使句,don't +动词原形
is catching 那只鹅正在捉鱼.正在进行的动作用一般进行时,be动词+动词-ing