Students identify nouns in a vocabulary exercise worksheet.

Problem Description:

The task is to identify and circle all the nouns in the given list. A noun is defined as a word that represents an animal, person, place, or thing.

Solution Approach:

1. Understand the Definition of a Noun:
- Animal: Words that represent living creatures (e.g., dog, cat).
- Person: Words that represent humans or human-like entities (e.g., Lisa, dad).
- Place: Words that represent locations (e.g., zoo, room).
- Thing: Words that represent objects or concepts (e.g., pencil, table).

2. Analyze Each Word:
- Go through each word in the list and determine if it fits the definition of a noun.
- Circle the words that are nouns.

3. Identify Non-Nouns:
- Words that are not nouns (e.g., verbs, adjectives, pronouns) should be excluded.

Step-by-Step Analysis:

#### First Row:
- Lisa: Person → Noun
- tooth: Thing → Noun
- eat: Verb → Not a noun
- It: Pronoun → Not a noun
- mango: Thing → Noun

#### Second Row:
- dog: Animal → Noun
- tree: Thing → Noun
- run: Verb → Not a noun
- there: Adverb → Not a noun
- am: Verb → Not a noun

#### Third Row:
- dad: Person → Noun
- pencil: Thing → Noun
- her: Pronoun → Not a noun
- stars: Thing (plural) → Noun
- saw: Verb → Not a noun

#### Fourth Row:
- find: Verb → Not a noun
- ears: Thing (plural) → Noun
- room: Place → Noun
- zoo: Place → Noun
- cat: Animal → Noun

#### Fifth Row:
- blue: Adjective → Not a noun
- bike: Thing → Noun
- table: Thing → Noun
- apple: Thing → Noun
- rug: Thing → Noun

#### Sixth Row:
- shoes: Thing (plural) → Noun
- look: Verb → Not a noun
- me: Pronoun → Not a noun
- chair: Thing → Noun
- how: Adverb → Not a noun

Final List of Nouns:

- Lisa
- tooth
- mango
- dog
- tree
- dad
- pencil
- stars
- ears
- room
- zoo
- cat
- bike
- table
- apple
- rug
- shoes
- chair

Circled Nouns:

```
Lisa tooth eat It mango
dog tree run there am
dad pencil her stars saw
find ears room zoo cat
blue bike table apple rug
shoes look me chair how
```

Final Answer:

$$
\boxed{\text{Lisa, tooth, mango, dog, tree, dad, pencil, stars, ears, room, zoo, cat, bike, table, apple, rug, shoes, chair}}
$$