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By the age of 4 they begin to use words in a proper sentence structure they become better conversationalist, they’re able to explain things properly. During age 4 they’re able to use verbs and subjects properly.

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By the age of 6  children have acquired over 14,000 words.  Many words that are difficult to pronounce the substitute it with words that sound similar. For example using the word “truck” they would say “tuck of fuck”
The grammatical errors are formed because they are not fully able to pronounce words properly. This could be because babies do not have sufficient muscles in the jaw and neurological connection are still being made. They tend to perform overregulization.

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Conservation: Is when a child cannot tell the difference between two objects having the same mass/volume but a different structure or shape. If you were to show them  A bottle of water and a cup with the same mass they wouldn’t be able to tell that the water from both objects share the same mass.

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During the preoperational stage  kids in preschool tend to think more symbolic and use words of objects to fully represent something.
Symbolic play:  is an activity in which children identify as a character while playing, by using objects to substitute real life things.
Example: Using a cover for a shield.
They also become egocentric by only seeing things from their perspective (viewpoint)
They also devolop being irrevistible in a sense that what they see is what it is.