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In this unit i learned the system and structure of past tenses: PAST SIMPLE Form Affirmative: Add -ed or -d to the base form of the verb Negative-: Add did or didn't to the base form of the verb Question: Add did plus subject before the base form of the verb Usage 1.For a past action when the time is given 2.When the time is asked about 3.When the action clearly took place at a definite time 4.Sometime the time becomes definite as a result of a question and answer in the present perfect PAST CONTINUOUS Form Affirmative: subject + was/were + verb+ing Negative: subject + was/were+ not+ verb+ing Question: was/were+ subject +verb+ing Usage 1.For interrupted past actions 2.Used without a time expression, it can indicate gradual development that took place in the past 3.It can express an action, which began before that time and probably continued after it 4. We use the continuous tense in descriptions PAST PERFECT Form Affirmative: subject+ had + past participle Negative: subject + had + not + past participle Question: had + subject + past participle Usage 1.The past perfect refers earlier than before now 2.It is used to make it clear that one vent happened before another in the past. It does not matter which eent is mentioned first-the tense makes it clear which one happened first PAST PERFECT CONTINUOUS Form Affirmative: subject + had + been + verb+ ing Negative: subject + had + not + been + verb + ing Question: had + subject + been + verb +ing Usage 1.To talk about longer actions or situations in the past that had been going on continuously up to the past moment we are thinking about.
