Helping [to] + infinitive verb?

verbs infinitives syntactic-analysis present-continuous

You use the verb 'help' with or without a 'to infinitive'. The meaning remains the same.

You don't help yourself but you help others. Your third sentence sounds like you're helping yourself in maintaining the library.

I'm helping _ in maintaining the library. You don't fill in that blank. The object of help could be anything but you.

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