我开始上课在8点用英语怎么说

"I start class at 8 o'clock" 就是 "我8点开始上课"。

来源：这是一句简单的英语句子，由主语"I"，动词"start"和宾语"class"组成。"at 8 o'clock"是时间状语，表示"以8点"。

例句：

I start class at 8 o'clock every morning. (我每天早上8点开始上课。)
My first class of the day begins at 8 o'clock. (我一天中第一节课8点开始)
I have to wake up early because my classes start at 8 o'clock. (我得早起，因为我8点开始上课。)