Is full stop necessary

It isn't necessarily wrong, if it is quoting a complete sentence which originally read: "John is my son." Otherwise, no, you would not use a full stop in such a situation.

Hi Setanta

I need clarification.

Are you saying that "John is my son." is okay requires a full stop after son?

Many thanks.

Pucuation for the sentence is always included within the quote marks.

"John is my son!" is okay.

Fred asked, "John is my son?"

that's - puncuation

Hi Sullyfish

I think you misunderstood my question.

"John is my son." is grammatcially correct.

Is a full stop after 'son' required or makes the sentence grammatically wrong?

Many thanks.

I'm not sure what you're looking for.

Yes, a period is required at the end of a sentence. It doesn't matter whether there are quotation marks. A sentence is still a sentence. The exception to this would be if the quotation (even a full sentence) were followed by something. For example, "John is my son," said Jason.

Let me change the sentence to make is clearer.

1. The sentence 'John is my son.' is not wrong grammatcally.

2. The sentence 'John is my son' is not wrong grammatcally.

3. 'John is my son.' is not wrong grammatcally.

4. 'John is my son' is not wrong grammatcally.

I think #2 and #4 are correct because the full stop is not required.
Am I correct?

Many thanks.

not wrong = correct.

'John is my son.' is gramatically correct.

All puncuation should be inside the quoted sentence.

'Do you want a cracker?' is a a correct question.

Thanks, Sullyfish.

I think I finally understand your question. You want to know if a period is used when a full sentence is included in a quote--when the full sentence is followed by something. Am I right?

If something follows the quoted material, the period is wrong.

"I said, 'I will go,' when I was invited." Or "I said 'I will go' when I was invited."

A question mark or exclamation point would remain within the quotes, but the period comes out.

Hi Roberta

1. "He is idiotic." is correct grammatically.

2. "He is idiotic" is correct grammatically.

Is it correct to put a full stop after ''idiotic'?

Is my question clearer now? I'm sorry that I've been unable to put the question that members can understand easily.

Best regards

Hi Roberta

1. "He is idiotic." is correct grammatically.

2. "He is idiotic" is correct grammatically.

Is it correct to put a period after ''idiotic'?

Is my question clearer now? I'm sorry that I've been unable to put the question that members can understand easily.

Best regards

Things are not really clearer. I'll try to respond to what I think the issue is.

If the sentence is made up of the words within the quotes--and only the words within the quotes--then there's a period.

"He is idiotic."

If the sentence is made up of the words within the quotes plus the words that follow the quotes, then there is no period.

"He is idiotic" is grammatically correct.

Dear Roberta

You've got what I wanted to know.

Thank you very much.

There is not one rule. One stylistic convention often used is that punctuation marks are placed inside the quotation marks only if the sense of the punctuation is part of the quotation (this system is referred to as logical quotation). This is not actually an American versus British English stylistic matter: at least one major British newspaper prefers typesetters' quotation (punctuation inside) and BBC News uses both styles; scientific and technical publications, even in the United States, almost universally use logical quotation (punctuation outside unless part of the source material), due to its precision; and much non-American English-language fiction uses the punctuation-inside method.