Unit 1: The Three Directions - Basic Sentence Structure
Unit 2: To-Infinitives - Understanding the Flow of Time
Unit 3 too ~ to … - too ~ to …
Unit 4 enough to ~ - enough to ~
Unit 5 only to ~ - to end up doing ~
Unit 6 Passive Voice + To-Infinitive - ~ to become (become) something
Unit 7 Subjects & True Subjects - Distinguishing between False and True Subjects
Unit 8: Using the Semantic Subject of the Infinitive 1 - for
Unit 9: Using the Semantic Subject of the Infinitive 2 - of
Unit 10: Usage of to-infinitive 1 - When there are two to-infinitives in a sentence
Unit 11 Usage of to-infinitive 2 - When there are three or more to-infinitives in a sentence
Unit 12 5-Format Sentences - Sentences with Two Subjects and Two Actions
Unit 13 5-Format Sentences with Causative Verbs 1 - make
Unit 14 5-form sentences with causative verbs 2 - have
Unit 15 5-form sentences with causative verbs 3 - let
Unit 16 5-Form Sentences with Prepositional Verbs 1 - help
Unit 17 5-form sentences with causative verbs 2 - get
Unit 18 Relative Pronouns 1 - who
Unit 19 Relative Pronouns 2 - whose
Unit 20 Relative Pronouns 3 - whom(~를)
Unit 21 Relative Pronouns 4 - which(~가, ~를)
Unit 22 Indirect Questions - Using Interrogative Clauses
Unit 23 Conjunction that - A signal flare within a sentence
Unit 24: Creating Subjects and Objects Using Subject-That Clauses
Unit 25 Conjunction if - If ~
Unit 26 Conjunctions as soon as - as soon as ~
Unit 27 Conjunctions when - when doing ~
Unit 28 Conjunctions every time - whenever ~ is done
Unit 29 Conjunctions even though - ~but, ~in spite of
Unit 30 Conjunction while - while, but
Unit 31: Describing at Length - Expanding from a Small Scope
Answer and interpretation

1.
Learn the principles of sentence expansion

We've minimized grammar terms and explained grammar in an easy-to-understand way so that you can understand it with a native speaker's mindset.
The author explains his core know-how on how to easily and naturally expand sentences.

2.
Pyramid-style English sentence extension

Based on what you have learned, you will practice writing in English by gradually increasing sentence length by adding short words and long phrases and clauses.
This exercise will help me to speak at sufficient length to say what I want to say.

3.
Describe the photo

After practicing extending sentences with various grammars, practice describing them in detail and at length by using what you have learned while looking at pictures.
This will allow me to convey my message to the other person more clearly and richly.

+Using the author's YouTube

Visit the author's YouTube channel, "English that Enlightens Principles."
You can improve your English skills more effectively by learning along with the video content within the channel.
Get help with your book study by watching the teacher's diverse and informative video content.