occasionally

"He measured his success relatively, that is, competitively."

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

"My friend told me there was something in the box, but I didn't know what it was yet. "

"The intervals between the houses on the street were uneven, some quite large and some very small. "

"Let me tell you how it happened."

"He discovered penicillin largely accidentally."

"My sometimes neighbor, a retired teacher, still visits the school occasionally. "

"Due to the remote location, bus service to the town is infrequent. "

"The book discussed the subject, but only incidentally."

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

"At this point, she seized the occasion to make her own observation."

"My frustration grew as my teacher kept pointing out my mistakes in front of the class. "