Lend your money. Lose your friend. You shouldn't lend your friend money because it may create issues. You'll have to bother your friend to repay the loan, or your friend may never repay the loan. Both can make your friendship worse.
例句：
You shouldn't have lent her money. Remember, “lend your money. Lose your friend.”
‘She's dealing with some debts. I think I'll lend her some money.' 'Lend your money. Lose your friend.'
Think carefully before you lend him money; “lend your money. Lose your friend.”
A friend in need is a friend indeed.
A true friend is always willing to help, especially during troubles or difficult situations.
例句：
She stayed by me when I was depressed about my parents' divorce, which made me believe that “a friend in need is a friend indeed.”
If Jack considered you to be his best friend, he wouldn't have left you when you were in trouble. Remember, “a friend in need is a friend indeed.”
I always help if I can because I believe that “a friend in need is a friend indeed.”
See eye to eye with someone
To have the same views about something, to completely agree with someone.
例句：
They're such a perfect couple. They see eye to eye on most things.
I can't bear being on the same team as him. I've never seen eye to eye with him.
If you don't see eye to eye with her on most issues, just say goodbye because sooner or later you two will break up.
Get on like a house on fire
To like each other a lot and become friends very quickly.
例句：
She looked very cold at first but when I talked to her, I realized she was very kind-hearted. After that, we got on like a house on fire.
The first time we talked, Annie and I got on like a house on fire.
I couldn't imagine my ex-girlfriend and current girlfriend getting on like a house on fire.
Know someone inside out
To know someone or something very well.
例句：
I know him inside out. I understand that he left for a reason.
'Mom, I'm so bored. Why do I have to read that book again? I know it inside out.'
Make sure you know him inside out before you say 'yes' to his proposal.
Speak the same language
To share the same viewpoints and attitudes toward something.
例句：
We speak the same language about almost everything.
I have to check with my teammates to make sure we speak the same language.
My partner and I speak the same language, so it's quite easy for us to negotiate.
