肯定句变否定句练习题 am a student
is here
are going to go fishing this week
are working hard
was a teacher
were very happy
can dance very well
will come to see you at the school gate
will clean the classroom tomorrow
do sports every day
often have breakfast at 7
do morning exercises on the playground
gets up at six
has something to tell his teacher
mother does some washing every morning
likes singing and dancing
visited the old man yesterday
had a good time yesterday morning
did his best to finish his work
read ten books last night
put his watch on the desk
has finished his homework
have learned English for ten years
has been in Beijing since 2000
has already finished his high school
’d better get up early
had better give up smoking
are some apples on the tree
had finishe
