What’s the difference between “At the/that time” and “At the/ that moment”? In which cases should they be used?
At the moment = now. "I'm in the garden with a cup of tea at the moment."
At that moment - "Mary unlocked the front door, and at that moment the telephone rang."
At the time = during the period when a past event happened. "I saw the Queen once. We were living in London at the time."
At that time is similar, but more likely to be used as part of a narrative. "At that time I had just moved to London."