1. I look forward to hearing from you
2. I look forward to hear from you
3. I am looking forward to hear from you.
4. We produce report without comprising quality and accuracy
5. We produce report without comprise to quality and accuracy.
Thanks a bunch.
4. The correct one. Without (prep) + gerund.
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1. "to" is a preposition, not part of an infinitive, so a gerund has to follow.
We produce reports without 'compromising/compromise to' quality or accuracy.
We produced a/the report without 'compromising/compromise to' quality or accuracy.
"I hear you" and "I am hearing you" If you choose to use a verb, "look," following the choice with the verb as in "I am..." "I LOOK forward to hearING from you."
4 and 5 are both incorrect. "We produce reportS without comprOMising quality and accuracy." or "We can produce a report without comprOMising quality or accuracy."