What is the difference between "sale" and "sales"
Please give few examples.

Thanks.
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Sales is plural of sale.
The employee only made one sale today because he only had a single customer.

The employee made many sales today because the store was very busy.
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"Sales is plural of sale."

So is a 'sale engineer' sells only one item; and a "sales engineer" sells more than one?
Sales engineer is the correct version. A sales engineer is someone that assists an actual salesperson with the technical aspects of the product they are selling, such as with computers or computer software.

So, in this case, sales is plural because the engineer works on more than one sale. Sale engineer isn't the proper usage.
JT2010Sales engineer is the correct version. A sales engineer is someone that assists an actual salesperson with the technical aspects of the product they are selling, such as with computers or computer software.

So, in this case, sales is plural because the engineer works on more than one sale. Sale engineer isn't the proper usage.
What if the engineer's job is to assist in one and only one item? Would 'sale engineer' be acceptable to clarify such a fact?
How about in a case, where an employee is teasing his coworker, calling him 'sale engineer'? Would that get his message across or should he calls his friend 'an one-item sales engineer' or ' a singleton sales engineer' ?
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Sales is used for the abstract noun meaning "relating to selling." Even if the person is responsible only for one product or one customers, the title is still sales engineer.

You could, I suppose, tease a co-worker by calling him a "sale engineer" if he had only one client, but you would be playing with language in doing so.
Grammar GeekSales is used for the abstract noun meaning "relating to selling." Even if the person is responsible only for one product or one customers, the title is still sales engineer.

You could, I suppose, tease a co-worker by calling him a "sale engineer" if he had only one client, but you would be playing with language in doing so.

Thank you!
That is perfect. Answering with 'pluralization' alone would lack the depth that might cause ESL students to possibly make a mistake.
So, JT2010, according to your logic here, we should use "students math club" instead of "student math club," and "Women Union" instead of "Woman Union," should we? Thanks.
JT2010Sales engineer is the correct version. A sales engineer is someone that assists an actual salesperson with the technical aspects of the product they are selling, such as with computers or computer software.

So, in this case, sales is plural because the engineer works on more than one sale. Sale engineer isn't the proper usage.
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