Grammatically Correct: The writer's essential guide to punctuation ...

'Are you guilty?' said Winston.
PUNCTUATION
'Of course I'm guilty!' cried Parsons with a servile glance at the
telescreen. 'You don't think the Party would arrest an innocent man,
do you?' His frog-like face grew calmer, and even took on a slightly
sanctimonious expression. 'Thoughtcrime is a dreadful thing, old man,'
he said sententiously. 'It's insidious. It can get hold of you without
your even knowing it. Do you know how it got hold of me? In my
sleep! Yes, that's a fact. There I was, working away, trying to do my
bit-never knew I had any bad stuff in my mind at all. And then I
started talking in my sleep. Do you know what they heard me saying?'
He sank his voice, like someone who is obliged for medical reasons
to utter an obscenity.
'"Down with Big Brother!" Yes, I said that! Said it over and over
again, it seems. Between you and me, old man, I'm glad they got me
before it went any further. Do you know what I'm going to say to
them when I go up before the tribunal? "Thank you," I'm going to
say, "thank you for saving me before it was too late." '
-GEoRGE ORWELL, Nineteen Eighty-Four
'Oh, Rumpole!' It was an astonishing moment. She Who Must Be
Obeyed actually had her arms around me, she was holding me tightly,
rather as though I were some rare and precious object and not the
old White Elephant that continually got in her way.
'Hilda. Hilda, you're not ... ?' I looked down at her agitated head.
'You weren't worried, were you?'
'Worried? Well, of course I was worried!' She broke away and
resumed the Royal Manner. 'Having you at home all day would have
been impossible!'
-joHN MoRTIMER, Rumpole and the Learned Friends
Note that exclamation points are by no means compulsory in
dialogue every time a speech takes on some emphasis. You may
often prefer to let your readers infer a character's emotions from
wording or context.
Athough the exclamation point normally appears at the end of
a sentence, it may occasionally be used as internal punctuation. The
text that follows does not have to begin with a capital letter, as it
is still part of the same sentence. (This text may, however, be
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