She smiled shyly.
She shyly smiled.
which sentence is right?
if the position of Adverb is not important, is it acceptable to write "Fast he runs" like this, then?
it sounds weird, but it might be because I'm not a good English speaker.
Learn English – Adverb position
adverb-position
Best Answer
Both of the first sentences are fine. Don't say "Fast he runs".
That's not even equivalent to the first two sentences anyway: the equivalent variants of your second sentence would be "He quickly runs" or "He runs quickly". ("He runs fast" is basically ungrammatical)
EDIT - to explain a bit more about "fast" vs "quickly":
"fast" is an adjective describing time, eg "He set a fast time in that race" or other nouns, eg "Wow, you were fast". ("You" is the thing being described here, and is a noun)
"quickly" is an adverb, ie an adjective describing a verb.
In "He runs quickly/fast", we're describing how the person "runs", which is a verb. Therefore, we need to pick the adverb rather than the adjective.
You will see people use "fast" as an adverb too, it's fairly common, but strictly speaking this is a colloquialism and not formally correct.