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Modals of deduction in the Past - Contenido educativo

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Subido el 22 de junio de 2023 por Victoria M.

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Explicación de los verbos modales para deducción en el pasado.

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Hello, this is Victoria Moriejo. Today we are looking at deduction in the past. 00:00:01
The modal verbs of deduction about the past are the following. 00:00:07
Must have, might have, may have, can't have, couldn't have. 00:00:13
How do we know if it's a deduction about the present or about the past? 00:00:18
Look at the examples. 00:00:24
She must be really tired from working all weekend. 00:00:26
This is a deduction about the present, because the infinitive is a simple infinitive, the verb to be. 00:00:31
Look at the second example. 00:00:39
She must have been very tired after she had to work all weekend. 00:00:41
This is a deduction about the past, because after must we have have been, which is a perfect infinitive, or a past infinitive. 00:00:46
So this is a deduction about the past. 00:00:55
When we are looking at deductions, depending on the model that we choose, we express different levels of certainty. 00:00:57
For example, if we are using must plus have plus past participle, we are expressing total certainty. 00:01:08
Helen couldn't find her phone. She must have left it at the school. 00:01:18
we are very sure that this is true. Rob must have had a good weekend. He's been 00:01:24
smiling all morning. We are quite confident that this is true. Then Mike 00:01:30
must have saved a lot of money. He's going on holiday to the Caribbean. Again 00:01:38
certainty. If we are not so certain we use a different modal verb. We use might 00:01:44
or may have plus past participle this is used to express possibility something 00:01:51
that something happened it may have happened or it may have not for example 00:02:00
Helen couldn't find her phone she might have left it at the school or Rob may 00:02:06
may have had a good weekend or Mike may have saved a lot of money is a bit 00:02:12
Then, when we think something is impossible, we can use the modal verse CAN'T or COULDN'T plus have plus past participle. 00:02:18
Right? This means that something is not possible. 00:02:30
For example, Rob can't have had a good weekend. He's had a long face all morning. 00:02:35
Or Mike couldn't have saved a lot of money. He's always eating out and shopping online. 00:02:43
Or Helen can't have left her phone at school. She didn't take it there. 00:02:51
That's all. Thanks for listening. Do you have any questions? Let me know. Bye bye. 00:02:57
Idioma/s subtítulos:
en
Subido por:
Victoria M.
Licencia:
Reconocimiento - No comercial - Compartir igual
Visualizaciones:
42
Fecha:
22 de junio de 2023 - 14:13
Visibilidad:
URL
Centro:
EOI E.O.I.DE SAN BLAS
Duración:
03′ 11″
Relación de aspecto:
2.01:1
Resolución:
1366x678 píxeles
Tamaño:
13.24 MBytes

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