"When was it invented?" PPT courseware 16

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"When was it invented?" PPT courseware 16

Here is a big box .Fisher invented it in 1901. It’s very hard-working. It can make your clothes clean and your housework easy. With its help you can have more time to relax or to work.

What’s it used for?

It is used for washing things.

Who was it invented by?

It was invented by Fisher

When was it invented?

It was invented in 1901.

What invention are they talking about?

The zipper.

Who invented the zipper?

It was invented by Whitcomb Judson.

When was the zipper invented?

In 1893.

When was it used widely?

In 1917.

Where can you see zippers?

On dresses, trousers, shoes, bags,… almost everywhere.

discover, invent and find are all verbs. Their meanings are similar, but there are differences:

★discover means "discovery", which refers to the discovery of something or phenomenon that originally existed but has not been discovered or known before.

The lost bike was discovered at the bus stop.

The lost bicycle was found at the bus stop.

Later I discovered that he was so kind.

Later I discovered that he was so kind.

★invent means "invention" and refers to the invention of something that did not exist before.

Do you know who invented the computer? Do you know who invented the computer?

★find means "to find, discover" and refers to discovery by accident or with little difficulty.

I found some old photos in that drawer. I found some old photos in that drawer.

4 steps to follow to change an active sentence into a passive sentence:

1. Change the object in the original active sentence into the subject of the passive sentence.

2. Change the verb into the passive form, that is, be + past participle, and note that the person and number change with the subject, while the tense of the verb remains unchanged.

3. If necessary, the subject of the original main sentence is placed after by and appears in its object form (note the object case of the pronoun). If not, it can be omitted.

4. The other components (attributive and adverbial) remain unchanged.

Use of passive voice:

(1) When it is not known who is the executor of the action or there is no need to know who is the executor of the action.

The house is quite old. It was built in 1950.

The house is so old, it was built in 1950. When will the road be opened to traffic?

When will this road open to traffic?

(2) When it is necessary to emphasize the object of the action, that is, the object. Calculator can't be used in the math exam.

Calculators may not be used on math exams. He was awarded first prize in that contest.

He finished first in the competition.

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Update Time: 2024-10-21

This template belongs to English courseware People's Education Press Ninth Grade English Volume 1 industry PPT template

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