feat: examples

ex/theme-08-this-these/practice-04.md

@@ -2,6 +2,8 @@
 
 ### Exercise 10. Complete the sentence
 
+Example: This is my ___ . -> bag
+
 1. __________ my red sock.
 2. __________ my new stickers.
 3. __________ a blue bottle.
@@ -9,6 +11,8 @@
 
 ### Exercise 11. Choose the answer
 
+Example: a) Yes, it is. b) Yes, they are. -> a)
+
 1. What is this?  
    a) This is a lamp. b) These are lamps.
 2. What are these?  
@@ -18,6 +22,8 @@
 
 ### Exercise 12. Make a sentence
 
+Example: my / book -> My book.
+
 1. this / a / poster  
    ____________________
 2. these / my / keys