IOS · Sentence Structure Time Attack

ONE independent clause.
It has exactly one finite verb (a verb that shows tense and agrees with its subject — including be verbs and modal verbs like can, must, should).
Example: IOS is a cat.

TWO independent clauses joined by a comma + FANBOYS (for, and, nor, but, or, yet, so).
Each clause has its own finite verb.
Example: IOS ran, and Willow followed.

ONE independent clause + at least one dependent clause.
The dependent clause has a finite verb but cannot stand alone.
Example: Because he was lost, IOS followed Willow.