That's not how life works

There are many tv programs for learners of foreign languages here in Japan.
I learned the sentence, that is "That's not how life works".

I thought I would have no opportunites to use this sentence when I watched the show.

But this morning the chance came.
:)

My daughter said in Japanese, "Mom, there is a piece of papaya in my granola. I said I don't want it!!"

So I said, "That's not how life works," in English.
She didn't understand English but knew what I meant.

You add a comma after the last word before a quote if the quote is in another sentence.

When a sentence inside of quotation marks ends with a period, but you still have more to say in the sentence outside of the quotation marks, the period in the quoted sentence changes to a comma. 

Example:

My friend told me today, "I'm a good cook." while we were walking home.

My friend told me today, "I'm a good cook," while we were walking home.

But if the sentence ended after the quote, it would be:

My friend told me today, "I'm a good cook."

If the punctuation in a quoted sentence is not a period, then it can be left alone. If a quote ends the sentence, the U.S. way is that the puncuation for the sentence outside of the quote is put inside the quote.

U.S. way:

My friend told me today, "I'm a good cook."

British way:

My friend told me today, "I'm a good cook".

Quotes are tricky. Great job!