move-to know how others feel and why feel that way

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Is the definition of "move" "to know...."? Is the definition grammatical?

eg. His speech moved people in the hall.
English - Writeacher, Saturday, January 31, 2015 at 12:31am
No, in that sentence, the word 'moved' means the speaker made the audience feel great emotion about his topic. Usually, that emotion leads to compassion and maybe action to help people in need, such as after the earthquake and tsunami in Japan a few years ago.

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1. to know how others feel and why feel that way

2. to know how others feel and why they
feel that way

(Which one is grammatical? Do we have to use 'they' before feel?)

Yes.

#2 is correct.

The second option, "to know how others feel and why they feel that way," is more grammatical. When using the pronoun "they," it is necessary to include it before the verb "feel" to clarify that it is referring to others. This helps to avoid ambiguity in the sentence. So, the correct version would be: "to know how others feel and why they feel that way."