As we use these phrases, they have very distinct standard meanings: 1# The man to help you is Mr. Green. = Mr Green is the right person to choose for any help you may need.
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Mister Micawber2# The man helping you is Mr. Green. = That person working with you now is Mr GreenThank you, MM.
norwolf B.The man who helped you (last week) is... D. The man who was helping you (last) is...I think the last week can't be omitted, because otherwise, we would change the meaning of the original.