How to use "though" in English ?

I get a little confused about the way the word “though” is tested in the ACT English section. Sometimes, it is grammatically correct to put “though”, seperated by 2 commas, in the middle of a sentence. But sometimes I recognize they put it at the end of the sentence, between a comma and a period. Hope you can help me figure out how to do this type of question.
Thank you all !!!

anyone help me ? :(((

Help you with what? Both of those usages are grammatically correct.

I wish that he hadn’t said that, though.
I wish, though, that he hadn’t said that.

You’re going to have to find an example of a question that tests it if we’re supposed to help you choose between the two. The only thing I can think of is which words you can insert it between in the second instance, and I’m not entirely sure the ACT would be testing that.

I got a question on the usage of though. Which one is right: 1) When spring comes though, all the hard work melts away. 2) When spring comes, though, all the hard work melts away. 3) When spring comes, though all the hard work melts away.

@S. Amontillado The second choice because there should be a comma after “When spring comes” since it’s an introduction. There should also be a comma after “though” because it’s parenthetical and would still make sense if it weren’t there.

Note: “When spring comes, all the hard work melts away, though.” would be awkward, although I don’t think it would be incorrect.

Second note, just to explain this better: This construction would appear in a paragraph similar to this:

“In the winter, the native people of Lower Slobbovia are all occupied in the back-breaking labor of ice mining. When spring comes, though, all the hard work melts away.”

I may realize what it is here : the word “though” would be better put in the middle of the sentence and separated by 2 commas if the preceding part and the later part mean that they are altogether a complete sentence.

“When spring comes, all the hard work melts away, though,” is incorrect because ‘though’ should be attached to the introductory phrase, not the main clause.

I don’t believe that. ^
http://www.oxfordlearnersdictionaries.com/us/definition/english/though_2
"used especially at the end of a sentence to add a fact or an opinion that makes the previous statement less strong or less important

Our team lost. It was a good game though.
‘Have you ever been to Australia?’ ‘No. I’d like to, though.’"

Sez who? You may be right, but I’m not aware of a rule to that effect. It’s often hard to distinguish something that violates a rule of grammar and something that’s just awkward. This is an opportunity for me to mention that the best way to prepare for these sorts of questions is to read as much well-written English prose as possible, so you’ll be sensitive to things that may seem correct, but that a good writer of English wouldn’t write.