Deduction

Deduction - Must have 

      This blog is dedicated to that you can learn English. We have two topics important, you can use any conversation.

 If you can learn easily, I recommend study every day, for two hours per 3 months. You must make a written of each session. 

Therefore, you can increase your learning.

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One of the most famous buildings in the world must be the great pyramid at Giza in Egypt. When you look at it.

you realise that it must have been extremely difficult to build. thousands of people must have worked on it. It is enormous! Until the twentieth century it was the tallest building in the world.

Building things now is quite easy. But it can not have been easy for the ancient Egyptians - they did not have electricity, or tractor, or lorries. So it must have taken a very long time to build, you would think. 

but it did not - it only took thirty years

Must is to say that you are sure something is true. You are sure because of what you now.

        It must be one of the most famous buildings in the world. 

        (I know that most people have seen pictures of it.)

        You are laughing. you must be happy.

        (I know that people who are laughing are usually happy.)

:::

Can not is to say that you are sure something is impossible. You are sure because of what you know.

        It is got a short neck. It cannot be a giraffe.

        ( I know giraffes have got long necks.)

        It is arrange and it tastes horrible. It cannot be milk 

        (I know that milk is white.)

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You can make the past if must and cannot like this:

        Must/cannot + have + past participle 

        The pyramid must have been very difficult to build.

        They must have used hundreds of tons of stone.

        It cannot have had tractors or lorries to help them 

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 Thanks for your attention. You can write in the comments. I can help you.