To say "as soon as possible" in English, you can use the phrase "as soon as possible" or the abbreviation "ASAP". This phrase comes from the Latin phrase "satis cito", which means "sufficiently quickly". Here are some examples of how to use this phrase in English:

"Please finish the project ASAP so we can meet the deadline."

"I need to book a flight as soon as possible for my business trip next week."

"Can you send me the report ASAP so I can review it before the meeting?"

"We need to resolve this issue as soon as possible to avoid any further delays."