Fix typos in 3-events.md

data/part-13/3-events.md

@@ -51,7 +51,7 @@ Let's assume the program was left running for a while, and then the exit button
 <Event(12-Quit {})>
 ```
 
-The first few events concern mouse usage, ten there are some events from the keyboard, and finally the last event closes the program. Each event has at least a type, but they may also offer some other identifying info, such as the location of the mouse cursor or the key that was pressed.
+The first few events concern mouse usage, then there are some events from the keyboard, and finally the last event closes the program. Each event has at least a type, but they may also offer some other identifying info, such as the location of the mouse cursor or the key that was pressed.
 
 You can look for event descriptions in the [pygame documentation](https://www.pygame.org/docs/ref/event.html), but it can sometimes be easier to print out events with the code above, and look for the event that occurs when something you want to react to happens.
 
@@ -122,7 +122,7 @@ Depending on how you use your arrow keys, running the program could look like th
 
 In the code above we have the variables `x` and `y` which contain the coordinate location for the sprite. The variable `y` is set so that the sprite appears at the bottom of the window. The `y` value does not change throughout the execution of the program. The `x` value, however, increases by 10 whenever the user presses the arrow key to the right, and decreases by 10 whenever the left arrow key is pressed.
 
-The program works otherwise quite well, but the key needs to be pressed again each time we want to move again. It would be better if the movement was continuous as the key was held down. The following program offfers this functionality:
+The program works otherwise quite well, but the key needs to be pressed again each time we want to move again. It would be better if the movement was continuous as the key was held down. The following program offers this functionality:
 
 ```python
 import pygame