7 Why didn't you tell me about your problem? If (you / tell) me, (1/try) to help you.

7. Why didn't you tell me about your problem? If you had told me, I would have tried to help you.

В данном предложении использовано условное наклонение третьего типа. Первая часть сложного предложения (If you had told me) выражает нереальное условие в прошлом, а вторая часть (I would have tried to help you) - результат, который мог бы произойти в прошлом, если бы условие было выполнено.

Ответ: you had told, I would have tried