Do you have any particular sentences that make you confused? Maybe if you post them, it will be easier to explain. Generally, there are certain verbs that don't requite "to".
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AnonymousWhat does "to" mean when an infinitive takes it?The "to" used with infinitives has absolutely no meaning whatsoever. It is just there to show grammatically, where necessary, that an infinitive is being used, and not some other form of the verb.