diff --git a/1-js/09-classes/06-instanceof/article.md b/1-js/09-classes/06-instanceof/article.md
index 0b02c99b..7e082aa5 100644
--- a/1-js/09-classes/06-instanceof/article.md
+++ b/1-js/09-classes/06-instanceof/article.md
@@ -44,7 +44,7 @@ alert( arr instanceof Array ); // true
 alert( arr instanceof Object ); // true
 ```
 
-Please note that `arr` also belongs to the `Object` class. That's because `Array` prototypally inherits from `Object`.
+Please note that `arr` also belongs to the `Object` class. That's because `Array` prototypically inherits from `Object`.
 
 Normally, `instanceof` operator examines the prototype chain for the check. We can also set a custom logic in the static method `Symbol.hasInstance`.
 
diff --git a/1-js/09-classes/07-mixins/article.md b/1-js/09-classes/07-mixins/article.md
index d5f1ab83..da230792 100644
--- a/1-js/09-classes/07-mixins/article.md
+++ b/1-js/09-classes/07-mixins/article.md
@@ -201,7 +201,7 @@ And `eventMixin` mixin makes it easy to add such behavior to as many classes as
 
 *Mixin* -- is a generic object-oriented programming term: a class that contains methods for other classes.
 
-Some other languages like allow multiple inheritance. JavaScript does not support multiple inheritance, but mixins can be implemented by copying methods into prototype.
+Some other languages allow multiple inheritance. JavaScript does not support multiple inheritance, but mixins can be implemented by copying methods into prototype.
 
 We can use mixins as a way to augment a class by multiple behaviors, like event-handling as we have seen above.