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they are going to have a basketball match next sunday

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they are going to have a basketball match next sunday
there is going to be a wonderful concert at the town theatre this sunday
为什么上一句用have,下一句用be?
还有这两句
the boys want to be football players.they get a lot of exercise
im going to practice really hard(指练足球)
我记得practice用于反复练习以求熟练
那为什么上面用exercise?
they are going to have a basketball match next sunday
上一句的主语是 they 句子主干是they have a match
下一句是 there be 句型
there is(不定式to后面用be了) a concert