The pandas are climbing trees中的“trees”为什么要加“s”

Pandas can climb the tree 一般疑问句 pandas / can / trees / climb / the 连成一句是问句 I don't think any of the pandas can climb that tree 改写同义句I think ______ ______ the pandas can climb that tree . Are the pandas eating bamboo?否定回答 英语“Pandas are all over the world Are there any pandas on the farm? PANDAS CAN CLIMB TREES.THEY ARE GOOD ().LOOPANDAS CAN CLIMB TREES.THEY ARE GOOD ().LOOK.THEY ARE () TREES.填上合适的单词 Pandas climb trees very fast.翻译 连词组句 at are tigers pandas looking the the 连词组句：at are tigers pandas looking the the the monkeys can climb trees.look!they are(climb,climbs,climsing)the apple trees. climb the mountains,the,in,are,any,pandas,there造句 Are there any pandas in the zoo 否定回答 pandas in there there the are zoo 连词成句 There are some pandas in the zoo(改为一般疑问句) There are any pandas in the park哪里有错 填空：the pandas are kind of shy,so please____quiet