1) I heard her scold the boss.
2) Let me tell you something.
The first " heard" is verb of senses. So we will stick to the this kind of sentence pattern.
I heard her scold ... ( You can also say " I heard her scolding the boss. " to emphasize the continuous action )
I saw her cross the road ... eg ( I saw her crossing the road )
The second example is a fixed rule. But I don't know how to explain it
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I assume you realize that the verbs scold and tell are base forms.
I [heard [her [scold the boss]]].
subject [verb [subject [verb object]]]
After a verb of perception you have a clause (telling what was perceived) with its subject in the object case and a verb that is a bare infinitive. (I heard it: She scolded the boss.)
Let [me [tell you something]]
verb [subject [verb object object]]
After let you have a clause (telling what is to be permitted) with its subject in the object case and a verb that is a bare infinitive. After tell you have an indirect object (the person being told) and a direct object (what was told). (Permit this: I tell you something.)
every verb has its own common patterns. You have to learn how to use every verb. That sounds pretty difficult! Yes, it is, but someone invented a special kind of dictionaries, dictionaries for learners (like "Oxford Advance Learner's Dictionary" and "Longman Dictionary of Contemporary English"). In those dictionaries you can find the answer to most of this kind of questions about patterns, because they tell you how to use every verb through some examples.
Is it "I heard her scold", "heard her scolding", "heard her to scold"? "Avoid do something" or "Avoid doing something"? Just check and you'll find the answers.
By the way, some of those dictionaries are also available online for free (no registration required).
Here are some patterns.
Subject Verb DirectObject
Subject Verb IndirectObject DirectObject
Anonymous1. I heard her scold the boss. In the passive voice, it becomes She was heard to scold the boss.
I saw the cat eat the mouse. In the passive voice, it becomes The cat was seen to eat the mouse.
The verb in the passive and active voice should be the same; in this case 'scold'.
2. The verb after let should be 'tell. We say Let me go NOT Let me goes.
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