To call an ambulance in Engpsh, you can say "I need an ambulance" or "Can you send an ambulance?" If you are in a situation where you need to call for emergency medical assistance, it is important to stay calm and provide the operator with clear and concise information about your location and the nature of the emergency. Here is an example of what you might say:

"Hello, I need an ambulance. My address is Main Street. Someone has collapsed and is not breathing. Please send help immediately."

It is also a good idea to have a phone with a local language translation app or a translator on hand to help communicate with emergency services if you are in a country where you do not speak the local language.