1. What were you doing in my office yesterday? 2. I have to write many letters tomorrow evening.
3. Did we have to finish the course paper by last Friday?

Why should I use Past Continuous Tense instead of Past Simple in first sentence; have to write instead of Future Simple in second sentence; did we have to instead of had we finished in third sentence?

Ineed . read the passage, and choose the two (2) inferences that are most firmly based on the given information. experts have blamed caffeine for bone loss among older women. but a university study of 138 older women found that caffeine had no such effect. in that study, women who drank more than five cups of coffee a day had the same bone density as women who got little caffeine. 1. bone loss among older women is not a problem. 2. the experts who blamed caffeine for bone loss may be wrong. 3. caffeine causes healthy bones. 4. some older wome