grammar tables: fill rowspan holes in the They're/We're/You're contraction tables (book prints one contraction brace-spanning three rows; GFM has no cell merging — repeat the contraction per row instead of leaving empty cells)

Co-authored-by: Cursor <cursoragent@cursor.com>

book-1-lesson-3.module

@@ -281,11 +281,13 @@ INTRO: One doctor is "he" or "she". Two doctors are "they" — and when that hap
 | He | is | a | doctor. |
 | **They** | **are** | | **doctors.** |
 
+**They + are = They're**
+
 | | |
 |---|---|
-| They + are = They're | doctors. |
+| They're | doctors. |
-| | pilots. |
+| They're | pilots. |
-| | barbers. |
+| They're | barbers. |
 
 So: {She's a doctor.} + {He's a doctor.} = {They're doctors.} — no "a", and "-s" on the job.
 
@@ -493,11 +495,13 @@ INTRO: When "I" joins anyone else, the group is "we" — and "we" takes "are".
 | I | am | a | student. |
 | **We** | **are** | | **students.** |
 
+**We + are = We're**
+
 | | |
 |---|---|
-| We + are = We're | doctors. |
+| We're | doctors. |
-| | pilots. |
+| We're | pilots. |
-| | barbers. |
+| We're | barbers. |
 
 {She's a student.} + {I'm a student.} = {We're students.}
 
@@ -533,11 +537,13 @@ INTRO: English uses the same "you" for one person or a whole room — only the n
 | You | are | a | mechanic. |
 | **You** | **are** | | **mechanics.** |
 
+**You + are = You're**
+
 | | |
 |---|---|
-| You + are = You're | doctors. |
+| You're | doctors. |
-| | pilots. |
+| You're | pilots. |
-| | barbers. |
+| You're | barbers. |
 
 One person: {You're a mechanic.} Several people: {You're mechanics.}