She was busy preparing lessons.
她忙于备课。
He spent a lot of time in the library preparing lessons.
他花了很多时间在图书馆的准备课上。
At the moment he was busy preparing his lessons.
那时，他正忙于准备功课。
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。
Our teacher was preparing the lessons when I came into the office.
我进办公室时，我们的老师在备课。
She said that she was preparing her lessons.
她说她在准备功课。
Our English teacher was preparing the lessons when I came into the office.
我进办我进办公室时，我们的英语老师在备课。
She is preparing her lessons now.
她现在正在预习功课。
Our English teacher was preparing the lessons when I came into the office.
我进办公室时，我们的英语老师在备课。
I can't see you tonight, I shall be preparing my lessons.
我今晚不能见你，我要预备功课呢。
I can't see you tonight, I shall be preparing my lessons.
我今晚不能见你，我要预备功课呢。
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