コーヒーのおかわりは有料ですか？って英語でなんて言うの？

A "top-up" means filling up the rest of the cup. Asking the server if the restaurant charges for a coffee top-up is another way of finding out whether they would charge you for it. Saying "Are there free refills?" is a common and straightforward way of asking whether you will be charged for a second (or third, or fourth!) cup of coffee.

Is it free? is probably the most common way to let the person serving you that you are not willing to pay for a refill. They will let you know right away if it is or is not. However, becareful when using this expression in the U.S. because most people see you as a cheap person and they might even treat you different. "Is it additional charge?" this expression is the same as above but the difference is that you are being very tactful in asking if they charge for a refill. This expression does not make you look as a cheap person therefore I recommond using it more often than the other one. At least in the U.S.

Some restaurants do a free refill on coffees when you go there so if you are unsure then it's best to ask the simple way would be 'are refills free?' you could also ask the waiter/waitress 'would this/the refill be free?' or 'do you charge to refill/top up my coffee?'

When you ask if you have to pay for refills you are asking if they will have a cost or if they are free. When you ask if refills are free you are asking to make sure they don't charge for refills.

The two sentences you see provided above are excellent ways to ask a person if the refills are free or not. In the first sentence you will see the verb charge. This means to ask a payment for something. In the second sentence you will see the noun fee. This refers the the amount of money for something in particular.

At a restaurant/cafe, when the waiter/waitress asks you if you would like a refill of coffee, you want to ask if a refill is free or not. Either of the above responses would be suitable for this scenario.

If you were at a restaurant or café and the waiter or waitress asks you if you would like a refill of coffee, and you would like to know whether refill's are free or not, you could ask any of the following: "Are refills free?", "Are refills chargeable?" or "Do you charge for drink top ups?".

On the house' simply means 'free'. It implies that the restaurant (house) will take care of the charge. 'Complimentary' also means 'free'. It comes from the word 'compliment', which is 'a polite expression of praise.'

All three of these phrases can be used interchangeably, however they can vary in structure slightly. The first one is very direct with using the word, "free," which means to not cost anything extra or no additional charge. The second two are asking if you would need to pay more if you got a refill. Whether you include the word, "additional," or not doesn't matter too much as it only explains if there will be another charge on top of the initial one.

Asking how much the refills are or whether or not there is a charge for the refill will get you the answer you need. Or asking when you order the coffee if there is a charge for the refills.