Ihave a question about tenses in english. when would you say, "someone had heard that something happened," instead of "someone heard that something had happened"? i'd really appreciate it if anyone could give me a specific example.

Read the passage. (1) since prehistoric times, milk has been a vital source of nutrition for human beings. (2) some doctors and nutritionists believe that consuming milk can be detrimental to our health. (3) milk is one of the most nutrient-dense beverages we can consume and it should be an essential part of a healthy diet. (4) drinking just one 8-ounce glass of milk per day puts you well on your way to meeting recommended daily intakes for important nutrients. which transition would be best to use at the beginning of sentence 2? finally additionally however specifically

Ineed . i need to write a story with this words. vapid, reverie, chastity, petty, invariably, posterity, axiom, pugnacious, bourgeoisie, knell

What is the the story about in the movie freedom writers be very detailed.