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Which sentence is more correct and which form of verb should be used for the last sentence?

The energy of sample A and the energy of sample B increase.

The energy of sample A and that of B increase.

The energy of each sample A and B increase.

The energy of sample A and B increase(s).

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    You missed out The energies of samples A and B increase, which might well be the most idiomatically acceptable and "correct" version. – FumbleFingers Apr 15 '20 at 16:29
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The questions can be simplified by identifying the subject(s).
1. energy and energy increase
2. energy and that increase
3. (not quite grammatical)
4. energy increases
(But note that if the energies of A and B are independent, 4 would be better as
4a. The energies of sample A and sample B increase.)

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  • do you mean that 3rd sentence is grammatically incorrect? it is possible that the 2nd sentence be written as "the energy of sample A and of B increase." ? – lee Apr 15 '20 at 19:43
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    Yes, the 3rd doesn't fit together. No, I think that suggestion for 2 would have to be "energies of sample A and of B increase." – Jack O'Flaherty Apr 15 '20 at 21:13

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