headnote

"My teacher explained the new math concept, and I understood it perfectly. "

"Have you read this book?"

"The teacher explained the new math concept quickly. "

"Except for one or two days a year, he usually walks to work."

"Studying different aspects of history, like economics and culture, helps us understand the past. "

"Detective novel writers try to keep up the suspense until the last chapter."

"The teacher gave a summary of the chapter's key points before the test. "

"To explain a chapter of the Bible."

"His mother provided some relevant background information concerning his medical condition."

"Before I tackle the question directly, I must briefly review historical approaches to the problem."

"After careful consideration, the student made a decision about which college to attend. "

"The beginning of the school year is always exciting. "