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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)
The present tense of the verb "hear" is "hear". For example, "I hear the music playing."
It is Hear Hear (originated from members telling others to 'Hear' what the speaker was saying)
Yes they can hear you.