文档介绍：1. This is the house.
They put their tools in it.
This is the house where they put their
tools.
in which
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2. Monday is the day.
We will come on that day.
Monday is the day when we will come.
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3. This is the reason. I left for a reason.
This is the reason why I left .
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4. July is the month.
The weather is usually the hottest in that month.
July is the month when the weather is
usually the hottest.
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5. April Fool's Day is that special day of the year.
On the day you should play a joke on someone.
April Fool’s Day is that special day of the
year when you should play a joke on someone.
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6. The city was beautiful.
We spent our vacation there.
The city was beautiful .
where we spent our vacation
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7. That is the restaurant.
I will meet you there.
That is the restaurant where I will meet you.
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8. The town is small.
I grew up there.
The town where I grew up is small.
in which
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9. March 10, 1876 was the day.
On that day the first complete sentence was sent over a phone.
March 10, 1876 was the day when the first
complete sentence was sent over a phone.
on which
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10. Nowadays people are more concerned about the environment.
They live in the environment.
Nowadays people are more concerned about
the environment where they live.
in which
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