As the other answers might suggest, we could start by considering four alternatives here, to identify two problems of agreement:
- Everyone put on his coat.
- Everyone put on his coats.
- Everyone put on their coat.
- Everyone put on their coats.
I agree with Jay in ruling out forms 2 and 3, which distract us with the question of whether each person had one coat (as I assume you meant), or whether the people have several coats each (form 2) or share one coat (form 3), considerations that seem silly.
So we are down to choosing between forms 1 and 4.
Many native speakers would certainly say form 4 in ordinary speech. They seem to think of "everyone" as meaning "they all," and proceed as if they had actually said that instead: they all put on their coats.
To me, that seems wrong. Everyone means "each person," and is singular, allowing only form 1. But there are some sticky points about choice 1.
First, I guess, form 1 sounds stilted. But secondly, there might be contexts in which the listener cannot be trusted to follow you in treating "everyone" as singular. For example, consider this story:
John invited his co-workers to meet him after work. At the end of the
day everyone went back to his house.
That story seems to dare the reader to guess whether each person went to his own house, or whether all people met at John's house.
So for those people who are conscious of the problem, perhaps the best solution would be to think about each use of such a construction. Treat "everyone" as singular, but if this results in confusing prose, in which the reader cannot tell whom you refer to, rewrite using legitimately plural words instead:
John invited his co-workers to meet him after work. At the end of the
day...
a) they all went back to his house; or
b) each person went to
his own house.
Your sentence is fine and polite as written. I have no grammatical suggestions.
However there may be more diplomatic ways to tell customers that you have included extra charges in the past, but not actually told them about it. This depends entirely on the context.
The general term is charge for costs associated with an item or service. You can charge a customer for the item itself or the service itself, and also charge them additional costs associated with other related expenses.
If you are a company that sends products to people through the mail, then shipping (the cost to send the product) is an expected cost. Sometimes this is referred to as shipping and handling, abbreviated as S&H. It's not uncommon to state the total price for an item, including shipping and handling.
A fee is usually the cost associated with a service of some kind, for example a registration fee, a processing fee, a licensing fee, and so on. Fees may also be penalties for some situation, such as a late fee or a returned check fee. There may be fees associated with the cost of delivering a product, if the delivery requires some kind of special service (an installation fee, for example).
A general way to talk about a document that details the charges in the bill is an itemized bill, or more formally a bill of sale. Less formally you can talk about an itemized receipt, or a breakdown of costs.
So, again as a suggestion:
In the past we included shipping in the total cost of the item, but we have decided to provide an itemized receipt to our customers so they can see a detailed breakdown of the charges.
Best Answer
"Their" is third person, used when you are talking about people who are not present or who are not the people you are speaking to. "Your" is second person, used when you are talking about the people you are speaking to.
So if you are talking to the people you want to thank, you would say "thank you for your support". If you are telling group A that you appreciate that support you got from group B, you would say "I want to thank B for their support."
If you are talking to a group that includes both the people you want to thank and others who are simply part of the audience, either could be appropriate. If you identified the specific group, you'd probably use "their". Like, "I want to thank the people from the Foobar Department for their support." If you were speaking more generally, like in your example, "I want to thank you all for your support".
All the sentences you give are grammatically valid and would probably mean the same thing. (Always depending on context.)