what is the difference between simple past tense and past perfect tense?
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These two tenses are both used to talk about things that happened in the past. However we use past perfect to talk about something that happened before another action in the past, which is usually expressed by the past simple. For example: ... The past perfect is often used with already, yet, just and even.
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The imperfect tense is different to the perfect tense because it tends to be used to describe one particular event in the past, rather than things that have happened in the past in general. For example, you may want to describe a particular concert you went to or a holiday you had.
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Remember that the past tense and present perfect tense can both be used to talk about things that happened in the past. The only difference is that we can use a specific time with the past tense, but we cannot use a specific time with the present perfect tense. I did it yesterday. I have done it.
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Both tenses are valid. So are: the past tense 'was issued' and the past perfect 'had been issued'. All are correct. Which one you should use depends on the context: the surrounding text.
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Remember- the simple past talks about something that happened before. It happened and it finished. ... The past progressive talks about something that was happening before, but for a period of time. It uses was or were + verb-ing like was eating or were playing.
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Generally speaking, the preterite is used for actions in the past that are seen as completed, while the imperfect tense is used for past actions that did not have a definite beginning or a definite end.
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Verbs come in three tenses: past, present, and future. The past is used to describe things that have already happened (e.g., earlier in the day, yesterday, last week, three years ago). The present tense is used to describe things that are happening right now, or things that are continuous.
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"I have made" is the present tense: you are describing the present, and in that present there exists a situation where there are some decisions that you have made, which are now in the past. "I made ..." is the past tense: this is more simple, you're just describing what happened in the past.
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Present Perfect vs. Simple Past. You must always use the Present perfect when the time of an action is not important or not specified. You must always use the Simple past when details about the time or place that an action occured are given or requested.
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The past perfect, also called the pluperfect, is a verb tense used to talk about actions that were completed before some point in the past. ... The past perfect tense is for talking about something that happened before something else.
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Wrote is the past simple tense. Written is the past participle.
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There is an important difference between the simple present and present continuous tenses. The simple present tense is used to talk about things that we do all the time. ... The present continuous tense is used to talk about things that are happening at the moment of speaking.
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The past perfect tense is used to show that something happened before another action in the past. It can also be used to show that something happened before a specific time in the past.
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The present perfect tense is used to talk about things where there is a connection between the past and the present, while the present perfect progressive began in the past, is unfinished, and continues into the future.
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Progressive Tense. A significant difference between these two tenses is we use the simple present tense for things that are permanent or are in general and the present progressive tense for things that may change or are temporary.
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The 'before' clause in your sentence is such a past time, so it can't be used with the perfect. Simple past 'worked' is the natural choice, though you can also say 'had worked'.
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English has one simple past tense, but Spanish has two: the preterite and the imperfect. The two past tenses refer in different ways to what has happened. They are called the simple past tenses to distinguish them from verb forms that use an auxiliary verb, such as "has left" in English and ha salido in Spanish.