1. Although the earth is round, people used to believe it wasn't. 2. Although the earth was round, people used to believe it wasn't. 3. Although the earth is round, people used to believe it isn't. Which one(s) is / are correct?

On 14 November 1998, Peter Hillary, Eric Phillips and Jon Muir -- across the enormous continent of Antarctica A) were walking B) have walked C) walked D) are walking E) have been walking "A" and "C" seem equally correct with

A) The modern jet airliner that / which we spent millions of dollars to build is a unique example of the aircraft production. B) The modern jet airliner -- we spent millions of dollars to build is a unique example of the aircraft production. C)

Until China becomes the most powerful nation in the world, with Chinese spoken universally, --. A) the problems of wide variations in English may well be lessened B) English will remain the primary language of science and diplomacy C) many

There seem to have been no eye-witnesses to the murder, -- ? What's the tag question for the above sentence?

What should have John done? What should John have done? Are both sentences correct?Any difference? How?

Hello Cool Breeze, Thank you for your comment.However, I don't see a good reason why we should avoid perfect infinitive. I also think that, whether "perfect infinitive" or "to infinitive", one may well sense a future

What conclusions can we draw from the following two sentences written in bold? 1. The next train to arrive was from York. A) The next train that was going to arrive was from York B) The next train that had arrived/arrived was from York C) The next

1. It's six weeks since I have recieved a message. 2. It's six years since I have recieved that message. Number two sounds wrong to me as a non-native speaker because of the use of "that". How does it sound to a native speaker?

"Nearly nine months ago Lost closed its third season in as nail biting of a place as it had ever closed a season ." I need a paraphrase of the sentence, especially the highlighted part. Thanks.