Here you can find the whole conjugation (past, present and imperative, active and passive) with vowels: http://arabicverb.com/conjugate/حوج/HH1 Here is the past: هو اِحْتَاجَ هما اِحْتَاجَا هم اِحْتَاجُوْا هي اِحْتَاجَتْ هما اِحْتَاجَتَا هن اِحْتَجْنَ أنتَ اِحْتَجْتَ أنتما اِحْتَجْتُمَا أنتم اِحْتَجْتُمْ أنتِ اِحْتَجْتِ أنتما اِحْتَجْتُمَا أنتن اِحْتَجْتُنَّ أنا اِحْتَجْتُ نحن اِحْتَجْنَا Any time you need to find a conjugation, go to this website, go to 'Analyze' at the top, and type in any verb to get all the forms (choose 'Options' and view the conjugation).

Note, on the first website they tried to simplify things for you and they expanded the ta marbuta ة into a ta ت for a few feminine words. The words originally would have a ta marbuta, but when you add the ending it turns into a ta. For example warda, flower, is وردة not وردت when it doesn't have the added ending. وردة changes to وردتك when you add the ending to say 'your flower'. This website has some errors in writing. The pronunciation is correct, however, and also there are some very useful examples. Use this to get a feeling for how it works, but for a more professional website look at the second website. Here is a good video for adding 'our' نا https://www.youtube.com/watch?v=i3NExF9ikto with lots of examples and pronunciation. There are videos for all the pronouns in this series.