学习内容：
unofficial holiday
April 1st is an unofficial holiday in the United States.
An 'unofficial holiday' is a day that many people recognize, but are not given the day off work for.
Notice the following:
April Fools Day is an unofficial holiday to mark the beginning of spring.
Do you have any unofficial holidays in your country?
in the past
In the past, April 1st used to be celebrated as the New Year.
'In the past' refers to a time before the present.
Notice the following:
I use to smoke cigarettes in the past, but I don't anymore.
That is all in the past now.
smart
A fool in English is someone who is not smart.
When you are 'smart' it means that are intelligent.
Notice the following:
She is very smart so I think she will pass her exams.
You are very smart for your age.
tradition
So a tradition started.
A 'tradition' is an established way of thinking or acting in a certain situation. It is something that was started in the past and is still done today.
Notice the following:
I think the traditions at Christmas are great.
Does your family have any traditions?
prank
On April 1st people would try to make, would do pranks on other people.
A 'prank' is a type of practical joke or a trick you play on someone.
Notice the following:
She probably will play some type of prank on me.
I do not like pranks and practical jokes.
