there were some boats on the lake改为否定句

there were some boats on the lake改为否定句 there were some boats on the lake.的意思 改为否定句：There are some boats in the river. there are some boats on the river改成否定句 there are some boats on the rive.改否定句 There were some books on the desk.(改为否定句) There were some films on the ground.改为否定句. 英语改写句子There were some ducks on the lake.(改为一般疑问句)There were There are many boats on the lake There are many boats on the lake . there were some tigers in the mountains.(改为否定句) there were some people in the street改为否定句