immediate future, die

[sitifan]

1. He's dying.
2. He's going to die.
What's the difference in meaning between the above two sentences?

[Barb_D]

All of us are going to die someday.
Someone who is "dying" is in the process of dying - from a fatal illness, over days; from a fall over a cliff, in moments. The end is imminent.

[Offroad]

[I am not a teacher]

In my opinion, they could both mean the same. 'He is going to die' suggests it will happen soon, maybe sooner than expected.

[sitifan]

All of us are going to die someday.
Someone who is "dying" is in the process of dying - from a fatal illness, over days; from a fall over a cliff, in moments. The end is imminent.

When someone says, "I am going to be late," being late is also imminent, isn't it?

[5jj]

When someone says, "I am going to be late," being late is also imminent, isn't it?

Of a person who is approaching death, we can say 'He is dying' or 'He is going to die'. The former lays more stress on the imminence of the demise.

[Odessa Dawn]

Do "I am dying" and "I am exhausted" share the same meaning?

[Rover_KE]

No, they don't.

However, not involving actual death, you can say 'I'm dying to meet André Rieu', 'I'd die for a cup of tea', 'She'll die if he doesn't call soon.' (See definition 13 here.)

Rover