Thành ngữ tiếng Anh

"- When pigs fly!( slang ) - never : Không đời nào, không bao giờ.
 + ex1: Will Ted teach Nam how to play the guitar? When pigs fly!
 + ex2: Sure, I'll give you my new laptop. When pigs fly!

 Besides this, you can use the following idioms for the similar situation:
 when hell freezes over. Never in a million years.

 - No spring chicken(humorous): a person who is no longer young: Một người không còn trẻ trung nữa.
 + ex1: Even though she is no spring chicken anymore, men still turn their heads to look at her.
 + ex2: Take it easy. You're no spring chicken yourself, you know.

 - (to) talk over: to discuss: thảo luận
 + ex1: David and I spent hours talking over the details of the plan.
 + ex2: Before you make any big decisions, give me a call and we'll talk things over.

 - If worse comes to worst: in the worst case,if absolutely necessary : Trong trường hợp xấu nhất.
 + ex1: Sophia's car isn't running well. If worse comes to worst, she can take a bus to school.
 + ex2: I know you're running out of money. If worse comes to worst, you can always sell some of your jewelry.

 - Easier said than done: more difficult than you think: nói thì dễ làm mới khó
 + ex1: You wanna climb Mt. Everest? Easier said than done!
 + ex2: Moving into a new house is easier said than done."