在10点之前怎么说英语

To say "before 10 o'clock" in Engpsh, you can say "before ten" or "prior to ten." For example:

"I need to finish this project before ten."
"Can we meet at 9:30 instead? That way we'll have time to go over everything prior to ten."

You can also use the word "by" to indicate that something should be finished or completed by a certain time. For example:

"I need to finish this project by ten."
"Can we meet by 9:30 instead? That way we'll have time to go over everything before ten."

It's also common to use the word "am" or "a.m." to specify that you're talking about the morning. For example:

"I need to finish this project before 10 a.m."
"Can we meet at 9:30 a.m. instead? That way we'll have time to go over everything before 10 a.m."

Keep in mind that in American Engpsh, the abbreviation "a.m." is typically used to indicate the time before noon, while "p.m." is used to indicate the time after noon. In British Engpsh, the terms "a.m." and "p.m." are not commonly used, and instead the 24-hour clock is used to specify the time of day. For example, 10:00 a.m. would be written as 10:00, while 10:00 p.m. would be written as 22:00.