“A non-refundable 30% deposit is required at the time of booking.”
You're looking for a reception hall to have your wedding in. You read this sentence on the website for one reception hall that you might like to reserve.
A non-refundable 30% deposit is required at the time of booking.
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(something) is required
When you say that something "is required", it means that people have to do it.
Things that people often say "are required" include:
- Attendance is required.
- Registration is required. (You have to register.)
- Immediate action is required. (You have to act quickly.)
- Further research is required. (This is often used at the end of academic journal articles to say that someone needs to research a topic more.)
- A permit is required. (You need a permit, which is an official document that shows you're allowed to do something.)
a non-refundable deposit
A "deposit" is some money that you pay at first when you're reserving something. You might need to pay a "deposit" in situations like:
- when renting a car
- when signing up for classes
- when renting an apartment
You can express the amount of a deposit like this:
a $400 deposit
a 10% deposit
Sometimes a deposit is "non-refundable". This means that you can't get the deposit back after you've paid it.
(do something) at time of (booking/registration)
This formal expression comes up in written legal agreements and policies. Use "at time of" to describe when something, like a payment, will happen. For example:
First and last months' rent is due at time of signing.
Your account will be charged at time of shipping.