The children __ (play) there ___ (happy).

问题描述:

The children __ (play) there ___ (happy).
求回答..求详细解释 跪了 不管我怎么写都有语法错,.Look! The children __ (play) there ___ (happy)Look! They __ (lie) in the sun

look, the children are playing there happily,look ,they are lying in the sun
有什么问题吗
现在进行时,没加Be动词吗?还是什么问题好吧 我不知道改词可以加BE动词。。结果在文档里打出来老是告诉我有语法错误。。哦哦,英语的基本时态要好好掌握下