Listen Joan (sing)in the classroom .She often (sing)there.

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Listen Joan (sing)in the classroom .She often (sing)there.
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Listen Joan (sing)in the classroom .She often (sing)there.
Listen Joan (sing)in the classroom .She often (sing)there.

Listen Joan (sing)in the classroom .She often (sing)there.
is singing
sings
第一个用现在进行时,因为有一个listen,表示现在
第二个用一般现在时,因为有一个offten,表示经常的动作