It really doesn't have anything to do with the verb being plain; 'help' gets both the base or to-infinitive form of the verb. Help us (to) understand. Help us (to) stay interested.
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It really doesn't have anything to do with the verb being plain; 'help' gets both the base or to-infinitive form of the verb.
Help us (to) understand.
Help us (to) stay interested.
Help us (to) become involved.
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The main difference between 'understand' and the other two verbs (stay