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She got behind with her work and so the teacher punished her.

I am getting behind on my target, so I am unhappy.

We are getting behind with our aim and I think we need a little more zeal towards our aim.

My brother will get behind in her studies if she choose the subject.

Please correct my sentences.
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User_garyShe got behind with her work and so the teacher punished her.

I am getting behind on my target, so I am unhappy.

We are getting behind with our aim and I think we need a little more zeal towards our aim.

My brother will get behind in her studies if she choose the subject.

Please correct my sentences.
I would use 'in' for these sentences. I don't quite understand the 2nd sentence (target?) or the 4th (chooses? - change of subject from brother to she?)
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ok. 'get behind' in studies or work doesn't just mean do poorly, it means that you have fallen behind your schedule. So, perhaps you should have read 3 books and written 9 essays about them, but you've only managed to read 2 books and write 4 essays. So it's hard to predict that someone will 'get behind' in something they haven't even started yet.
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Comments  
Thank you Phillip.

Let I explain you what I meant in the second sentence :

Suppose, on Monday, I was planned to complete some work by Saturday. So, by Thursday I should have completed the half of my work otherwise I am behind my target.

Let think, I wrote the sentence on the Thursday. Do you think now it is correct?

I am getting behind on my target, so I am unhappy.

As to the 4th sentence, it was a typo. Otherwise, do you think this is correct?
User_garyThank you Phillip.

Let I explain you what I meant in the second sentence :

Suppose, on Monday, I was planned to complete some work by Saturday. So, by Thursday I should have completed the half of my work otherwise I am behind my target.

Let think, I wrote the sentence on the Thursday. Do you think now it is correct? "I am behind schedule" is best, I think.,

I am getting behind on my target, so I am unhappy.

As to the 4th sentence, it was a typo. Otherwise, do you think this is correct?
Please rewrite the sentence for me so I'll be sure what was typo. Glad to help.
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Thank you Phillip.

My brother will get behind in her studies if she[he] choose the subject.

I mean, by this sentence, that my brother won't study as I expected if he choose the subject because he is weak in that particular subject.
 nona the brit's reply was promoted to an answer.