ADJ

charitable, kind
heroic
a heroic act of bravery
aggressive, barbaric, hostile, provocative, terrorist, violent
appalling, despicable, outrageous, terrible
criminal, illegal, unlawful, wrongful
careless, foolish, impulsive
conscious, deliberate, positive, voluntary, wilful
private
a private act of revenge
public
creative, dramatic, physical, political, symbolic
homosexual, sex/sexual
balancing, disappearing, juggling, vanishing
The UN must perform a difficult balancing act between the two sides in the conflict

VERB + ACT

commit (law) , perform
charged with committing an act of gross indecency

PREP

in the ~ of (= doing something)
~ of
For Jane, the act of writing was always difficult

PHRASES

an act of faith, love, violence, will, worship, etc., catch sb in the act (of doing sth)
He was caught in the act of stealing
the simple/very act of doing sth
The very act of writing out your plan clarifies what you need to do

VERB + ACT

bring in, introduce, pass
The Act was passed by a majority of 175 votes to 143
amend
repeal
The old Act has now been repealed
breach, contravene
The company had breached the 1994 Companies Act

ACT + VERB

become law, come into force
The new Children's Act will come into force next year
contain sth, say sth, state sth
The Act contains regulations for banks and building societies

PREP

under an/the ~
He was charged under the Firearms Act of 1977

ADJ

class (informal) (used for sb who does sth well)
Their new striker looks a class act
double
comedy double act French and Saunders
live
their reputation as one of rock's most impressive live acts
main, support
The main act will come on at about ten o'clock
cabaret, circus, comedy, song-and-dance, stage, variety

VERB + ACT

do, perform
He does a little song-and-dance act
rehearse, work on

ADJ

opening
final, last
first, second, etc.

PREP

in (the) ~
The king is killed in the opening act

VERB + ACT

put on
Don't take any notice?she's just putting on an act!

ADV

at once, immediately, promptly, quickly, swiftly
The government must act promptly to change this law
correctly, legally, properly
illegally, improperly, unconstitutionally, unlawfully, wrongly
reasonably, responsibly, sensibly, wisely
dishonestly, dishonourably, unreasonably
oddly, strangely, suspiciously
Jenny has been acting rather strangely recently
bravely
decisively
effectively
in good faith
His defence was that he had acted in good faith
in self defence
The jury accepted that he had acted in self defence
accordingly
George knew about the letter and acted accordingly

PREP

against
The government needs to act against the sale of these dangerous toys
for/on behalf of sb
His solicitors are continuing to act for him
like
Stop acting like a spoilt child. hormones in the brain that act like natural painkillers
on
Alcohol acts quickly on the brain
out of
I suspected that he was acting out of malice

PHRASES

act in sb's best interests
We are all acting in the best interests of the children

ADV

brilliantly, well
badly