The Singular, The Plural Or Uncountable?

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Jan 26th 2012 18:03
When I write an email or a journal in English, it's still tricky for me to choose a noun as the singular or the plural or uncountable.

For example, "joy" can be countable and uncountable:

The followings are uncountable examples. All sentences are quoted from my dictionally.

"I wish you joy of your success."
"He danced for joy at the news."

The followings are countable.

"I shared joys with my family."
I take for granted that a person who wrote this sentence has many joyful happenings or events with his or her family.

"His children were a great joy to him."
In this case, I surmise the birth or the existence of his children was a great joy to him.

I wrote the following sentence in my last entry.
"Thinking and writing in English have brought an unexpected joy into my life."
I was advised to omit "an". That makes sense because my joy isn't only one.

I have a question.
In this case, I can say either "unexpected joy" or "unexpected joys"??