Can I write to "hearing" from you soon or to "hear" from you soon? Which sentence is correct?

I look forward to hearing from you or looking forward to hear from you or ?
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The grammar of this structure is 'to look forward to' + noun/gerund.

I am looking forward to the movie tonight.
I look forward to hearing from you.
Thank you very much my teacher.
Students: We have free audio pronunciation exercises.
I look forward to hearing your advice
Hi,
Fine, except that you have a spelling mistake.
Clive
"Hearing" is the correct form!
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"I`m looking forward to hearing from you in may?" ... is this sentence built correctly?
Yes, but May should be capitalized and there should be no question mark.