She was busy preparing lessons.
她忙于备课。
She is preparing the new lessons with other teachers.
她正在同其他老师一起准备新课（备课工作）。
The new term has just started. She must be very busy preparing her lessons.
新的学期刚刚开始。她现在一定是忙于备课。
She said that she was preparing her lessons.
她说她在准备功课。
She is preparing her lessons now.
她现在正在预习功课。
She is preparing her lessons now.
她现在正在预习功课。
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