A new medicine have to be invented to satisfy this problem
A new medicine have to be invented to answer this problem
A new medicine have to be invented to solve this problem.
Study basic grammar. Memorize the rules for verb conjugation. Even native speakers have to do that.
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Study basic grammar. Memorize the rules for verb conjugation. Even native speakers have to do that.
The subject takes a singular verb.
In this context,I think we talk about a drug, not a medicine.
Do you invent a drug, or do you discover or find itI don't find satisy. or solve very suitable. I'd say eg A new drug has to be found to cure this sickness.Clive