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The future tense of hear is will hear.
hear - hear(s), hear(ing/s), hear(able), hear(er/s), hear(ken), hear(say), hear(se/s/d), hear(ten/s)
It is Hear Hear (originated from members telling others to 'Hear' what the speaker was saying)
It would be "hear hear," because the term can be used to call others to hear.
Yes they can hear you.