Umm.. Any site ending in .Gov or .Edu
Encyclopedia
Books written in depth on the subject
Any written or spoken words from creditable people who study\mastered the subject
Hope this helps.
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Answer:
Because they are our relatives and they want to see our graduation, one of the happy days.
Also, when they see our happy day, they are also happy and it is very important to make them happy.
They can see our graduation and remember their graduation and be moved.
It was a little short, but I hope it worked.

Do is a command, in the past instructing.
Does is in the present, currently doing.
Answer:
There are pictures on the wall.
Are those snakes or not?
Are there boxes of chocolates on the table?
Cows have tails.
Those are squirrels, aren’t they?
I saw them riding away on horses.
We cannot send letters without stamps on.
His sisters are nurses aren’t they?
Flies are insects but spiders are not.
The children have apples in the hay.
Explanation:
Hope this helps!