On a Friday, the dean caught me in the hall just as I was preparing to enter my classroom.
周五，校长在大厅里碰到我，我正准备要到教室去。
I see him enter the classroom.
我看见他走进教室了。
Passing by the classroom building yesterday evening, I saw Mr. Smith dressed in white, wearing a white hat, enter the laboratory.
昨天晚上我路过教学大楼时，我看见史密斯先生身穿白衣服、头戴白帽子，走进了实验室。
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