1. Compound elements 1
One way to avoid repeating shared information (a weak sentence) is by creating a strong (best sentence) with a compound element.
Use the coordinating conjunctions and, or, but, and yet to change the weak sentence into a best sentence using Compound Elements.

2. s v S V . The tiger slept on the large tree branch, but it kept a
One way to avoid repeating shared information (a weak sentence) is by creating a strong (best sentence) with a compound element. Use the coordinating conjunctions and, or, but, and yet to change the weak sentences into a best sentence using Compound Elements
s v S V
The tiger slept on the large tree branch, but it kept a
watchful eye open. (compound sentence comma)
  s v v
The tiger slept on the large tree branch but kept a watchful eye open. (compound element no comma)

3. Lopez ran down the street, but he V .
Punctuation: since it is a compound element no comma is needed
s v S
Lopez ran down the street, but he V
stopped at the corner. (compound sentence comma)
S v v
Lopez ran down the street but stopped at the corner. (compound element no comma)
Lopez ran but stopped

4. Punctuation: since it is a compound element no comma is needed.
They are good friends, and they enjoy the same sports.

5. They are good friends, and they enjoy the same sports.5
Punctuation: since it is a compound element no comma is needed.
They are good friends, and they enjoy the same sports.
They are good friends and enjoy the same sports.
They are and enjoy

6. 2. The basketball hit the rim, but it failed to go through.6
1. Lauren had read her book, and she had written her book review by the deadline.
2. The basketball hit the rim, but it failed to go through.
3. He forgot to take his band uniform, and he forgot to take his drums.
4. They read books while on vacation, or they watched TV while on vacation.

7. Punctuation: since it is a compound element no comma is needed.
1. Lauren had read her book and written her book review by the deadline.
2. The basketball hit the rim but failed to go through.
3. He forgot to take his band uniform and his drums.
4. They read books or watched TV while on vacation.

8. The tiger slept on the large tree branch but kept a watchful eye open.8
The tiger slept on the large tree branch but it kept a watchful eye open.
The tiger slept on the large tree branch but kept a watchful eye open.

9. 9
The tiger slept on the large tree branch, but it kept a watchful eye open. COMPOUND SENTENCE COMMA
The tiger slept on the large tree branch but kept a watchful eye open. COMPOUND ELEMENT NO COMMA

10. 10
Bridge
Adverb Clauses
Even though Kostya was afraid of almost everything at the beginning of the story, he gained confidence by doing something difficult—rescuing the girl and retrieving the bikes.
Because Kostya had his moment of insight by rescuing the girl and saving the bikes, he decided he could take on this new adventure—going to Moscow.