答案是：（1）There are not any tree near the river
(2）Jim doesn't like to play with his toys
(3)Mike doesn't study hard at school
(4)Jack doesn't have a music lesson once a week.
(5)Sue can't skip the rope
(6)You needn't finish your homework at once
(7)Tom won't make a modle ship for me
(8)My father won't be free tomorrow morning
(9)I needn't go to bed early tonight
(10)Alice didn't meet her friend in the street yesterday
(11)Mum didn't do the washing up after supper
(12)He didn't read English this moring
(13)The new watch didn't cost me 200 yuan
(14)she didn't put the key ring in the box just now
(15)I didn't find a wallet on the ground
(16)she didn't lend me her dictionary
(17)The children didn't blow bubbles in the garden yesterday morning
特别需要注意第12、13、14题,因为其中的三个动词原形和过去式一样,这不是一般现在时而是过去式