Below are the major categories of what you can expect to be questioned about for the mid-term:
Sentence Types: simple, compound, complex, compound-complex
Parts of Speech: noun, verb, adverb, pronoun, adjective, infinitive, appositive, etc.
Punctuation: comma usage, semi-colon usage, colon usage, etc.
Phrases: prepositional phrase, gerund phrase, adverbial phrase, etc.
Title: correct punctuation and capitalization
Vocabulary: all vocabulary from Units 1-3 could be on the the test.
Writing: genre, style, author's purpose, controlling idea, conclusion, proper steps for writing etc.
You should be able to understand author's purpose, context clues, inferences, and contrasting ideas.