Answer:
"You are going near the post office?" Mrs. Reid asked her husband.
"Yes," he said. "Is there anything you want?"
"Could you get me a small registered envelope, please?" Mrs. Reid said, "I've got to send some money to my sister in Guyana."
"Ok," Mr. Reid said. "I'll get a Coulee. It may be useful to have a spare one available."
Explanation:
There are many ways that this paragraph could be punctuated. However, in my interpretation, I used commas to integrate my quotation marks, etc.
For example:
"Ok," Mr. Reid said. "I'll get a Coulee. It may be useful to have a spare one available."
I decided to add a period to the end of "said." However, you could choose to do it differently. For example, you could choose to write it like this:
"Ok," Mr. Reid said, "I'll get a Coulee. It may be useful to have a spare one available."
(Notice how I replaced the period with a comma? That simply means that "Ok and "I'll get a Coulee" is all one sentence versus two sentences. Both versions are grammatically correct. The writer simply needs to choose which one s/he wants.)
