It's not rocket science
It's not complicated
Under the weather
Sick
Go back to the drawing board
Start over
Let the cat out of the bag
Give away a secret
The ball is in your court
It's your decision
The early bird gets the worm
The first people who arrive get the best stuff
Burn bridges
Destroy relationships
He's sitting on the fence
He can't make up his mind
Like riding a bike
Something you never forget how to do
Like two peas in a pod
They're always together
Shape up or ship out
Do better or leave
The ship has sailed
It's too late
Time is money
Work quickly
Through thick and thin
In good times and bad times
When it rains it pours
Everything is going wrong at once
Once bitten, twice shy
You're more cautious when you've been hurt before
Have your head in the clouds
Not to be concentrating
Every dog has its day
Everyone gets a chance at least once
Calm before the storm
Something bad is coming, but not right now
There's a method to his madness
He seems crazy but he's actually clever
He's a chip off the old block
The son is like the father
Add insult to injury
To make a bad situation worse
Actions speak louder than words
Believe what people do and not what they say
Let someone off the hook
To not hold someone responsible for something
Go on a wild goose chase
To do something pointless