Answered By: Writing Center Last Updated: Apr 19, 2015 Views: 0
Simple present perfect tense follows the format: subject + has/have + past participle form of the verb; simple past tense follows the format: subject + past form of the verb. Their usage are different in the following ways:
1. Simple present perfect tense is used to show what has happened now, while simple past tense is used to show what happened in the past.
2. Simple present perfect tense is used for the newest things, while simple past tense is used for those that are not new.
3. Only simple past tense can be used for finished time, for example: I did my work yesterday. (Yesterday is finished time, so do not use I have done.)
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