So, this isn’t that hard once you think about it. All you need to do is put all the words in a sentence and see if the sentence happened ready or is happening.
Example: She walked down the street. Did this happen or is this happening? The answer is that she did walk down the street, so it’s past tense, so color it blue.
Example 2: I laugh at the joke that she made. Did this happen or is this happening? It is happening, so color it yellow.
Blue: walked, listened, laughed, played, grinned, and chomped
Yellow: all the other verbs
I really hope that this helped you with your homework! Comment if you have any questions! :)