שיעור 13: Past Progressive

why is the sentence " he was helping me with the projector" correct ? taking care of the projector is not a continuous action why not using : " he helped me with the projector"
It's all a question of context, was the time of the action specific. For past simple, you need a specific time: He helped me with the projector last Tuesday. This can be an answer to: "When did he help you with the projector?"

For the past continuous, it is used when describing something that occured while something else was happening: "While He was helping me with the projector, the light suddenly went off."