Update file week09.md

docs/assignments/week09.md

@@ -73,7 +73,7 @@ together to give you the shape that you want. I have tried multiple ways to solv
 
 #### **1ST SAMPLE**
 
-I really like the idea of inflatable origami and want to make some with baking paper. I fold some simple pleats and sealed the edges with glue. However after it expands once when I blew air inside, it cannot come back to its original shape. 
+I really like the idea of inflatable origami and want to make some with baking paper. I fold some simple pleats and sealed the edges with glue. However after it expands once, it cannot come back to its original shape. 
 
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