an

"The movie was entertaining from start to finish."

"You must do your homework before you can watch television."

"John and I have been friends ever since we were roommates at college.   Trust is important between friends.   I used to find it hard to make friends when I was shy."

"In the first year of school, pupils are taught to recite the alphabet."

"The finish of the school year was a relief for all the students. "

"Be sure to finish your homework before you go to bed!"

"I will do it, though."

"My brother and I both attend the same high school. "

"The waiter’s face lit up when I gave him a twenty."

"an old abandoned building;  an old friend"

"My sister is always driving me crazy."

"There are twenty-six letters in the English alphabet."