lesson 21 grammar

docs/howtostudykorean/unit-1/01-sentences.md

@@ -1399,7 +1399,7 @@ Examples
 
 <Details>
 
-*This is the first time you are being introduced to a word that must be conjugated in order to be used. Visit [Lesson 5](./05-tenses.md) for more information. Any word that ends in “*다*” must be conjugated to be used. The conjugation of* 이다 _is different than other words. I introduce all of these conjugations in [Lesson 9](https://www.howtostudykorean.com/unit1/unit-1-lessons-9-16/unit-1-lesson-9/)._
+*This is the first time you are being introduced to a word that must be conjugated in order to be used. Visit [Lesson 5](./05-tenses.md) for more information. Any word that ends in “*다*” must be conjugated to be used. The conjugation of* 이다 _is different than other words. I introduce all of these conjugations in [Lesson 9](./09-conjugate-이다.md)._
 
 Common usages
 
@@ -1713,7 +1713,7 @@ The focus of this lesson (and [Lessons 2](./02-particles.md), [3](./03-verbs.md)
 
 The conjugation of sentences is very important, but so is the structure of sentences. When creating these lessons, I went back in forth many times thinking about which one I should present first. You can’t conjugate sentences if you don’t have a logical sentence to conjugate; and you can’t create a logical sentence if you don’t know how to conjugate it. In the end, I figured it would make more sense to present the information this way – where learners are introduced to sentence structure and then learn how to conjugate the words within the sentence.
 
-Throughout all of my lessons, I use example sentences to show how grammar can be used. The example sentences in Lessons 1 – 4 are not conjugated. However, directly beneath each non-conjugated sentence is a conjugated version of the same sentence in parenthesis (one formal and one informal conjugation). You might want to glimpse at how the words are conjugated, but remember that this will be taught in [Lessons 5](./05-tenses.md) and [6](./06-honorifics.md) (for verbs and adjectives) and [Lesson 9](https://www.howtostudykorean.com/unit1/unit-1-lessons-9-16/unit-1-lesson-9/) (for 이다).
+Throughout all of my lessons, I use example sentences to show how grammar can be used. The example sentences in Lessons 1 – 4 are not conjugated. However, directly beneath each non-conjugated sentence is a conjugated version of the same sentence in parenthesis (one formal and one informal conjugation). You might want to glimpse at how the words are conjugated, but remember that this will be taught in [Lessons 5](./05-tenses.md) and [6](./06-honorifics.md) (for verbs and adjectives) and [Lesson 9](./09-conjugate-이다.md) (for 이다).
 
 ---