VERBS
be, feel, look, seem, sound | become, get, grow | remain
ADV
deeply, especially, extremely, genuinely, greatly, particularly, really, seriously, very | increasingly | a bit, a little, quite, rather, slightly, somewhat
(not) unduly
He seemed unduly concerned about missing a single day of work.
naturally | rightly | simply
PREP
about/at/by/over
Parents were concerned about their children spending too much time on video games.
for
I was really concerned for my friend after she didn't answer her phone all day.
VERBS
be
ADV
especially, particularly, specifically | entirely, exclusively, solely
centrally, chiefly, essentially, largely, mainly, mostly, predominantly, primarily, principally
The new policy is concerned primarily with improving safety standards in our workplace.
closely, directly, intimately
PREP
with
The doctor was concerned with making sure the patient took all their medicine.