Simple. One independent clause (subject = The stars, predicate = twinkled in the clear night sky).
10
My best friend and I walked to school together.
Simple. One independent clause, compound subject (My best friend and I).
10
The storm destroyed the crops in the valley.
Simple. One independent clause (subject = The storm, predicate = destroyed the crops in the valley).
10
I wanted to go swimming, but the pool was closed.
Compound. Two independent clauses joined by but.
15
She enjoys painting, and he prefers sculpting.
Compound. Two independent clauses joined by and.
15
The match was cancelled; the players were disappointed.
Compound. Two independent clauses joined by a semicolon.
15
We could take the bus, or we could walk home.
Compound. Two independent clauses joined by or.
15
Although the road was icy, we continued driving.
Complex. Dependent clause (Although the road was icy) + independent clause (we continued driving).
20
I stayed quiet because I didn’t want to start an argument.
Complex. Independent clause (I stayed quiet) + dependent clause (because I didn’t want to start an argument).
20
She smiled when she saw her best friend at the station.
Complex. Independent clause (She smiled) + dependent clause (when she saw her best friend at the station).
20
Whenever the teacher asked a question, the students quickly raised their hands.
Complex. Dependent clause (Whenever the teacher asked a question) + independent clause (the students quickly raised their hands).
20
Because the film was long, we were exhausted, but we still enjoyed it.
Compound–Complex. Dependent clause (Because the film was long), independent clause 1 (we were exhausted), independent clause 2 (we still enjoyed it).
25
The boy who lives next door is very friendly.
Simple
25
I didn’t finish the book, yet I passed the test because I studied the notes.
Compound–Complex. Independent clause 1 (I didn’t finish the book), independent clause 2 (I passed the test), dependent clause (because I studied the notes).