Imagine I'm writing a story in past tense. Here come some questions: SENTENCE 1: "Tom simply couldn't imagine how different the world had been when his father was at Tom's age: there hadn't been ...
Look at this sentence: I knew that the sky is blue. To me, it doesn't make sense to say the sky was blue since it still is blue. Even so, is it grammatically incorrect to say I knew that the sky ...
What is the right word to the gap (21)? (had/have) That is about 400 years earlier than when the Inca Indians were thought to (21) __ discovered the silver in the ground. I think it's had as ...