Both past continuous and past perfect continuous tenses can be used to talk about actions or situations that were in progress at a certain point of time in the past. While the past continuous merely shows continuity, the past perfect continuous tense also puts an emphasis on the idea of duration.
The past tense describes a past event or a state of being.The past tense is categorized further depending on whether the action was in progress or has been completed. The four past tenses are the simple past tense, the past progressive tense, the past perfect tense, and the past perfect progressive tense. This page contains examples of the past tense.
The present tense usually describes a current event or state of being, but, oddly, the present tense can also describe past and future events. The four present tenses are the simple present tense, the present progressive tense, the present perfect tense, and the present perfect progressive tense.