''Look at this group of people piaying beach volleyball'' 这个句子中,''play''为什么用ing形式?如果是现在进行时,又为什么没有be动词?

look at the notice of this group, look at this group of girls__(dance) under the tree. look at this group of people是一句话吗? Look at this group of people playing beach volley是什么意思 look at this group of boys going to s____ school Look at this group of peopie piaying beach volleyball. Look at this group of people beach volleyball翻译成汉语 Look at this group of people playing beach volleyball.为什么play要加ing? look at this group of people playing beach volleyball的结构分析 Look at this group of people playing beach volleyball是什么句 Look at this group of people playing beach volleyball.是不是现在进行时? Look at this group of people playing beach vollyball为什么没有be动词? this,look,group,peolpe,at,of,playing,volleyball,beach连词成句 Look at this picture. look at this picture Look at this mess. Look at this! look at this