I have came across a sentence made without "for" or "to", therefore I have a little confused.
The sentence is:
It can help you maintain a healthy weight.
Don't we need to use preposition before "maintain", such as "to" or "for"?
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This sentence uses the infinitive form of the verb maintain. In English, infinitives can include "to" or they can omit it, the latter is called a "bare infinitive."
In most cases, there is a correct preference for either the bare infinitive or to-infinitive. You have found one of the rare ones where either is correct.