It forms the simple past, which is used to express an action that has started and finished at a specific time in the past.
As you can see with all of these examples, the action that takes place is over and done with. I saw Star Wars yesterday. Seen is the past participle of the verb see , and it is used to form the perfect tenses: present perfect, past perfect, etc.
I will explain everything below. The easiest way to tell which word is correct and which is incorrect is that seen must have alongside it a helping verb. Past participles cannot appear by themselves in a sentence. It is important to note that you cannot use the present perfect tense with specific time expressions.
Instead, it is used to describe an action that has happened at an unspecified time before now or one where the action extends to the present. In this example, I am describing a past and ongoing event that leads up until the present. Forgot Password. Reset Password. Verify Code. Verification Code.
Re-send verification code to your inbox. Good Job! The code is correct. Acing the GMAT made easy. And FREE! The freeway to an awesome SAT score, is now here! The freeway to an awesome LSAT score, is now here! Get the score that opens doors to top business schools in India Explore. Invite friend Tutoring Application Builder. Follow Author What else you can do inside qs leap? Learn more. Virtual One-to-One Meetings. I saw a dog. I have seen a dog.
What are the differences between them? Did these events happen on the same day? Improve this question. Ben Kovitz They could have happened 5 minutes ago, or they could have happened 5 weeks ago. All we know is it's happened in the past. I just tried to explain why it's hard to give a fully satisfactory to this question here.
Add a comment. Active Oldest Votes. Improve this answer. Jim Reynolds Jim Reynolds 9, 20 20 silver badges 43 43 bronze badges.
I think memorize was a much clearer word. The important thing is to discourage people from trying to learn the difference by memorizing hundreds of piddly rules for specific situations. Memorize is still there, just not repeated. I think memorize includes storing, or certainly can, so wasn't logical in the list of acts. It's like learning to ride a bicycle by reading sets of instructions.
It doesn't help people, but our beliefs in this area tend to transcend the rational. Ah, I hadn't noticed the preceding memorize. I'm a little worried that "encode" is too obscure an idea for a typical EFL learner, though. How about "recall" to replace the whole computer-storage-and-retrieval metaphor? It's language that brain and learning scientists use for cognitive processes. Maybe the computer is the metaphor, then. Show 1 more comment. In the past I saw a dog.
Now I have seen a dog. Community Bot 1. This is flat-out wrong. Both tenses are most often used to talk about past events. The most important difference between them involves how they are conceptualized from the viewpoint of the present.
I saw a dog - one time event in the past -today, yesterday The thing could be usual or unusual but the effect still remains. I have seen penguins. They were in Toronto Zoo. Maulik V Maulik V It has to do with the time the event took place and if it continues into the present. If you told your friends about your trip to Toronto and said ' I saw penguins at the zoo in Toronto' it would be right. If you said ' I have seen penguins at the zoo in Toronto' it wouldn't be right because the listener would wait for you to give additional information.
If you visited a different zoo and saw penguins you would say 'I have seen penguins at the zoo in Toronto and they were much bigger than the ones they have here'. Many people would still use the simple past in this context because it's just simpler and easier.
It gets tricky if you want to assign a specific or unspecific time period.
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