This video tutorial in the Language category will show you how to understand the sequence of tenses for English. This is useful when you want to change direct speech to indirect speech and also for understanding conditional sentences. When the sentence is originally in the present tense, it can be changed to past tense. For example Paul said, "I am hungry". You can change this to indirect speech either in the present tense or in the past tense. So, the sentence can be said as Paul says he is hungry or Paul said he was hungry. You can watch the video for more tips.