'was now taking place' A student asked me about the grammar in a sentence from an article I had sent him last week. I wasn't able to explain whether the use of 'was not taking place' in the following sentence was correct or not, and why: "Work was now taking place to ensure the AI-system could differentiate between ads and people, it added." Could anyone help me dissect the grammatical structure of the sentence and explain the use of 'now' in the past continuous tense? Thanks a lot! Here's a reference to the article: https://www.bbc.com/news/technology-46357004?intlink_from_url=https://www.bbc.com/news/topics/ce1qrvleleqt/artificial-intelligence&link_location=live-reporting-story