1. Review: All sentences need: Capital letter End mark Make sense
Subject (WHO or WHAT the sentence is about)
Predicate (Describes the subject or tells more about it).

2. Review:
A subject is the part of a sentence that is a NOUN. It is usually in the beginning of a sentence.
Example: The boy jogged quickly.
The boy is the subject or noun. 
A predicate is the part of a sentence that has a VERB. It usually is in the end of a sentence.
jogged quickly is the predicate or the verb.
***EVERY SENTENCE needs a noun and a verb.

3. New INFO: There are 3 different types of sentences: SIMPLE COMPOUND
COMPLEX

4. A simple sentence has a subject and predicate and that is it.
The girl swims very well.
Subject Predicate

6. A complex sentence is usually more detailed and has a cause and effect
A complex sentence is usually more detailed and has a cause and effect. So it will say “this happened” because “this happened first”. It has an event and another outcome because of that event. These sentences sometimes have commas but not always. They usually have the word because, since, although, after, when, that, who or which in the middle of them.  
Cause/reason Effect/outcome
1. When he finished his homework quickly, he forgot to give the teacher the last page.
Effect/outcome Cause/reason
2. The teacher returned the homework after she noticed the error.
3. The students are studying because they have a test tomorrow.
Cause/reason Effect/outcome
4. After they finished studying, John and Marry went to the movies.