在12点之前怎么说英语

To say "before 12 o'clock" in English, you can use the phrase "before noon" or "before midday." For example, you can say "I need to finish this task before noon" or "I have a meeting at 10 a.m., so I need to leave the house before midday." If you want to be more specific and specify a specific time before noon, you can use the phrase "before [time]" such as "I need to be at the airport before 10 a.m." or "I have to finish this project before 9 a.m."