VERBS

be, seem
get

ADV

extremely, particularly, really, very
a bit, fairly, a little, pretty, quite
Things were pretty tough at first

PREP

on
It's very tough on the wives when the husbands go off like that

VERBS

be
become, get

ADV

extremely, particularly, very
fairly, pretty, quite
enough
Has the government been tough enough on polluters?

PREP

on
The government has promised to get tough on crime
with
You have to be tough with these young thugs

VERBS

be, feel, look, seem
become, get, grow
act, talk (both informal)
Then this guy started acting tough

ADV

incredibly, really, remarkably, very
pretty, quite, reasonably
enough
Are you sure you're physically tough enough for this job?
mentally, physically