What are the two main parts of a sentence?

 Subject and the Predicate.

In the sentence 'The little brown cat is sleeping,' identify the complete subject.

The complete subject is 'The little brown cat.'

What is a compound subject? Provide an example.

Consists of two or more simple subjects joined by a conjunction. 

In imperative sentences, what is typically understood to be the subject?

In imperative sentences, the subject is often understood to be 'you.'

Define a simple predicate and provide an example.

A simple predicate is the main verb or verb phrase that tells something about the subject. 

Example: 'The cat is sleeping.'

Identify the subject and predicate in the sentence: 'The fox saw a bunch of grapes.'

Subject: 'The fox'; Predicate: 'saw a bunch of grapes.'

In the sentence 'Rohan and Sita went to the market,' identify the compound subject.

The compound subject is 'Rohan and Sita.'

What structure do sentences have when they follow a subject-verb-object format? Provide an example.

Sentences with a subject-verb-object structure have the subject performing an action on an object. Example: 'She baked a cake.'

Provide an example of a complete predicate.

An example of a complete predicate is 'is sleeping on the couch.'

In the sentence 'The children are playing in the park,' what is the predicate?

The predicate is 'are playing in the park.'