She went to the library.She borrowed some books.She started writing her paper.(parallel structure)

We don't have to put off our trip plan to the seaside.The weather is fine.(complex sentence)

The practice of free-writing eliminates some obstacles.The practice of free-writing allows a writer to generate creativity.(simple sentence)

We've invited the boss.She may not come.(compound sentence)

I graduated from university.I started to work in my hometown last year.(complex sentence)

The coach was so excited.The fans jumped for joy.We won the volleyball game.(compound-complex sentence)

Our debating team has trained hard for this contest.We have a good chance of winning.(compound sentence)

The challenge comes unexpectedly.Some people feel anxious.Others face it calmly.(compound-complex sentence)

Scicntists were convinced by the evidence,the local authorities,however,were slow to act.

Not having read the course materials carefully,their exam failed.