Fill in all the gaps for these perfect tense forms. If there is no 4th principal part, enter "none." You should use the special keypad to enter the macrons (long marks). Press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!