understand the structer

Re: understand the structer
The word you want is "structure." I have corrected your sentence:

"I could have told him all this, but it was fairly obvious he wasn't going to be around long enough for it to matter."

It means that the person referred to, "he," was not aware of something. The person who writes this sentence could have explained the situation to him, but he was only going to be in that place for a short period of time, so the person writing the sentence did not think it was worth the time and effort to explain things to him.

express my thanks
thank you for pointing out my mistake and also for your reply.

You are welcome. I'm glad that you are working so hard to learn English--i hope that you will come back to see us many times.