现在进行时：
sb.is doing sth.
sb.are doing sth.
而且又是复数,所以必须用 are.
[ ]Tina and Julia working hard at their lessons
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相关问题
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Students ____ ____ ____（应该）work hard at their lessons.
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— Each of the students, working hard at their lessons, _____
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they both study hard and are ____ at their lessons well good
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Work hard at your lessons and you will pass the mid-examinat
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All the chilldren work hard at还是work hard on our lessons
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our teachers always ____ us work hard at our lessons
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-------Each of the students，working hard at his other lesson
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Mark and Jack ___work hard.Their parents and grangparents___
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—Each of the students, working hard at his or her lessons, _
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Jim works hard at his lessons.He doesn't want to ____.