correctly identify the subject and complete verb in the sentence:

I should have taken more Caribbean literature courses

One of our subscribers wrote a letter of complaint about the magazines quality

Your tickets will be sent to you by the first week of November

Bram stoker is best known for his novel Dracula

2 answers

#1. Subject: I
verb: should have taken

#4. subject: Bram Stoker
verb: is

Now you try the others. A good first step is to eliminate all preopositional phrases, since they cannot be nouns or verbs.
subject tickets
verb sent