Time to play!
Keep the decks of cards separated and shuffle each well. The game is played like slap jack.
Set a timer for 6-10 minutes (or longer).
Turn the top card (black and white cards) on the present tense deck over so each player can read it. Leave it face up.
Now begin turning the colored (present tense) cards over one at a time, forming a pile. The player to spot the past tense version (e.g. left) of the present tense verb (e.g. leave) and slap the card first gets to take all the cards underneath.
When the timer goes off, count each player's score. Whoever has the highest number wins!