I found that in discourse, "that" or other pronouns can refer to many things. Sometimes it is an idea or it can involve specific elements in the discourse.
But because I am not a native English speaker, I ask my questions here to make sure I understand the nuances.
Also, I want to know the differences between using "was", "is", and others such as "will be".
Examples I came up with:
(a)
A: John cheated on his girlfriend.
B: That was/is/will be wrong.
Question 1: What are the differences in meaning between using "was" and "is" and "will be"?
Question 2: Does "that" refer to the action of cheating on someone in general or John's cheating on his girlfriend?
I ask (2) because I think B might've replied, "That was wrong. But if John's girlfriend were bad-tempered, the cheating thing would not be wrong." But I am not sure my understanding is right. I need your help.
(b)
A: Nick took off his clothes and showed his body on the streets.
B: That was/is a crime.
Question 3: What are the differences in meaning between using "was" and "is" and "will be"?
Question 4: Does "that" refer to the action of one's taking off clothes and showing the body in general or Nick's taking off clothes and showing the body?
I ask (4) because I think B might've replied, "That is a crime. But if Tom Cruise did that, it wouldn't be." But I am not sure my understanding is right. I need your help.