1. He will die.

2. He shall die.
3. He will{stressed] die.
3-1. He intends to die.
4. He'll die.
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Q1: Does #4 mean #1 or #2?
Q2: When 'will' is stressed as in #3, does #3 mean #3-1? (the volition of the subject)
Q3: Doesn't #4 mean #3? Can the contracted form have the meaning of #3?

Q1. #4 means #1.

Q2. Yes
Q3. No, 4 means 1.

2, 3, and 3-1 mean the same.

Q1: In this context, #4 ("He'll die") typically means #1 ("He will die"). The contraction "he'll" is often used as a shortened form of "he will." However, it's important to note that context and tone can sometimes alter the intended meaning, so without additional information, it's always best to consider the specific context in which the statement is being made.

Q2: When "will" is stressed, as in #3 ("He will [stressed] die"), it typically implies a strong determination or intention on the part of the subject. While it is not explicitly stated in the sentence, it can suggest that the subject has made a firm decision or has a strong desire to die. So, in this case, #3 can be interpreted as meaning #3-1 ("He intends to die").

Q3: It can be argued that #4 ("He'll die") could have a similar meaning to #3 ("He will [stressed] die"), conveying the sense of the subject's strong determination or intention to die. While the contracted form "he'll" doesn't explicitly indicate volition like the stressed "will" in #3, the overall context and tone of the statement can still influence the interpretation. However, it's important to remember that the contracted form "he'll" is more commonly used to simply express a future event (#1), unless there are additional contextual clues suggesting otherwise.