Mrs. English gave a speech today.
Mrs. Martinez gave a speech today.
Mrs. English and Mrs. Martinez gave speeches today.
Combining the two subjects from the original sentences creates a compound subject in the new sentence. See? It's just like how we combine two words to create a compound word, like cupcake.
You can also combine the predicates of two sentences.
My teacher smiled.
She giggled at my joke.
My teacher smiled and giggled at my joke.
Combining the two predicates from the original sentences creates a compound predicate in the new sentence.
Now you try it in the comment section of this post. Double check your C.U.P.S. before you click submit.