I would never guess vs I would never have guessed

[Alexey86]

Hello! Macmillan Dictionary defines I​/​you​/​she etc would never guess as follows:

used for showing that you think something is not at all obvious

Looking at her now you’d never guess she’d been so upset.
I’d never have guessed that they were married.

Let's consider the following contexts:

- Did you know she is his wife?
- Really? I’d never have guessed they are (were?) married. (It looks like the third conditional: If X hadn't happened (If you hadn't told me), Y wouldn't have happened (I wouldn't have guessed) = Y happened because X happened.)
- Really? Looking at them I’d never guess they are married.

- She was crying all day yesterday.
- Really? Looking at her now I’d never guess she’d been so upset.
- Really? I’d never have guessed she'd been so upset. (Implication: if you hadn't told me)

My questions:
1) Does the variants in red also work?
2) I’d never have guessed they are married (now) or I’d never have guessed they were married (now)?
3) Is "had been upset" correct, or should I use "was upset"?

 

[Charlie Bernstein]

Hello! Macmillan Dictionary defines I​/​you​/​she etc would never guess as follows:

used for showing that you think something is not at all obvious

Looking at her now you’d never guess she’d been so upset.
I’d never have guessed that they were married.

Let's consider the following contexts:

- Did you know she is his wife?
- Really? I’d never have guessed they are (were?) married.

Both are and were make sense. I'd use were.

(It looks like the third conditional: If X hadn't happened (If you hadn't told me), Y wouldn't have happened (I wouldn't have guessed) = Y happened because X happened.)
- Really? Looking at them I’d never have guessed they are married.

- She was crying all day yesterday.
- Really? Looking at her now I’d never guess she’d been so upset.
- Really? I’d never have guessed she'd been so upset. (Implication: if you hadn't told me)

My questions:
1) Do the variants in red also work?

See the one correction.

2) I’d never have guessed they are married (now) or I’d never have guessed they were married (now)?

Both make sense. I like were.

3) Is "had been upset" correct, or should I use "was upset"?

Both are natural and mean practically the same thing.

I just know how to speak and write. I can't help you with conditionals. So let's see what the grammarians here think.

(I like getting corrected here because it teaches me things.)

 

[Alexey86]

Really? Looking at them I’d never have guessed they are married.

Thank you! I'm not sure why you changed this sentence. I'd like to know if Looking at them I’d never guess they are married is correct, given that Looking at her now I’d never guess she’d been so upset is.

 

[Alexey86]

Charlie, would you please explain why you changed the sentence? Do you think "would never guess" is incorrect?