Collocations for hard - adj.

be, feel, look, seem
The chairs felt hard and uncomfortable.

become, go
Don''t leave the cake uncovered or the icing will go hard.

stay

extremely, very | a bit, fairly, quite, rather

rock hard
The toffee was rock hard.

be, look, seem | become, get
Life got very hard.

make sth
If you tell the children the answers, it only makes it harder for them to do the work on their own.

find sth
I found the exam quite hard.

extremely, really, very | a bit, fairly, pretty, quite, rather