what are the boys doing? 这些男孩正在干什么？
They are +现在分词，例如：They are running，They are jumping，等等
what are the boys doing?
they are 动词加ing
应该有图或提示，根据实际情况填写动词即可
They are walking.列举,动词＋ing。现在进行时。
They are playing football/basketball.
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