Barking Up The Wrong Tree

Idiom: Barking Up The Wrong Tree

Example 1: 

Lisa: Did you see that new guy in class? He is SO cute!!

Tina: Oh, you mean James? Yes, he is very handsome! He is my brother's friend.

Lisa: I want to go out on a date with him.

Tina: Lisa, you are barking up the wrong tree!!

Lisa: What do you mean?

Tina: He is gay. He isn't interested in girls!

Example 2:

News Anchor: The police investigation revealed that Mr. Thompson was not guilty of committing the burglary. It was actually his neighbor who had committed the crime. The police finally realized that they were barking up the wrong tree by accusing Mr. Thompson.

Meaning: To waste your effort pursuing the wrong thing, person or path.

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Let Nature Take Its Course

Idiom: Let Nature Take Its Course

Example 1: 

My daughter Isabella is 17 years old. She just graduated from high school and I am worried about her. The thing is, she has never dated anyone. All her friends have gone on dates but her.

Should I try to help her? Or should I let nature take its course?

Example 2: 

Ted: My friend didn't study at all last term for his algebra class. I took the final exam one day before the rest of the class. After the exam, he wanted me to give him all of the answers.

Irene: He wanted you to cheat?! Well, did you give him the answers?

Ted: Oh, no. I let nature take its course: he failed the exam.

Meaning: To let nature take its course means to let things happen naturally with no interference from an outside source.

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