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.

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