My Grammar and I (Or Should That Be 'Me'?): Old-School Ways to Sharpen Your English

Ones that got away
He doesn’t play fair.
I’ve got it bad.
They’re going steady.
Go slow !!
All of these are acceptable colloquialisms, but you might think twice about
using them in formal writing.
And  here’s  an  oddity:  She  worked  extremely  hard.  Hard  is  an  adverb
qualifying the verb worked (How did she work? Hard). And extremely is an
adverb  qualifying  the  adverb  hard  (How  hard  did  she  work?  Extremely
hard). Despite the fact that hard looks like an adjective, we know that it is
an  adverb  because  it  qualifies  the  verb.  If  you  invented  an  adverbial  form
for  it  you  would  get  she  worked  hardly  ,  which  just  sounds  odd,  or  she
hardly worked which means something completely different. Go figure.