Special Uses of the Comma

To prevent misreading

After we ate the mushrooms proved to be poisonous.

Miscellaneous

Alice Walker was born in Eatonton, Georgia, in 1944.

On May 18, 1998, the legendary singer Frank Sinatra died.

With nonrestrictive (interrupting) constructions that are not necessary for the meaning

My brother's car, which was wrecked last week, is a classic Thunderbird.

But not with restrictive constructions that are necessary for the meaning

The computer that is on the left is the one you should use.

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