Answer: Present: jump, Past: jumped; Present: play, Past: played; Present: sing, Past: sang; Present: eat, Past: ate
Explanation: To change a regular present tense verb to a past tense verb you usually add 'ed' to the end of the word. In most examples, when a regular verb ends with a 'y' (like study, try, or carry) you drop the y and add 'ied' instead. However, there are some irregular verbs that don't follow these rules, and just need to be memorized. Some of these irregular verbs also end in y (like buy or say), but don't get changed to 'ied' (these unique cases probably need to be memorized too).