Не надо делать это по-другому.

Questions & Answers about Не надо делать это по-другому.

How does по-другому fit into the pattern of adverbs we are learning?
It is formed using the prefix по- and the dative ending of the adjective другой (other or different). Just as по-моему means "in my way" or "in my opinion", по-другому literally means "in another way", which translates as "differently".
Why do we use the imperfective verb делать instead of the perfective сделать?
When you tell someone not to do something using не надо, you almost always use the imperfective aspect. It indicates a general prohibition against the action itself ("do not do this"). Using the perfective сделать with не надо is rare and would sound unnatural here.
Why is это used here rather than этот or эту?
In this sentence, это is a standalone pronoun meaning "this thing" or "it". It is acting as the direct object of делать. You would only use этот or эту if it were attached to a specific masculine or feminine noun, like этот план (this plan).
Could I say не нужно instead of не надо?
Yes, не нужно means exactly the same thing ("there is no need" or "you shouldn't") and is perfectly correct here. Не надо is simply more common in everyday spoken Russian when telling someone not to do something.

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