Write down a sentence in a contraction in each box.

Write down a sentence having a contraction in each box.

Write down a sentence with a contraction in each box.

Write down a sentence in a shortened word in each box.

Write down a sentence having a shortened word in each box.

Write down a sentence with a shortened word in each box.

Write down a sentence containing a shortened word in each box.

--------------------------
Are the sentences all grammatical? Would you take a look at the expressions above?

Write down a sentence in a contraction in each box. incorrect

Write down a sentence having a contraction in each box. correct

Write down a sentence with a contraction in each box. correct

Write down a sentence in a shortened word in each box. incorrect

Write down a sentence having a shortened word in each box. incorrect

Write down a sentence with a shortened word in each box. incorrect

Write down a sentence containing a shortened word in each box. incorrect

The term "shortened word" isn't used. Use "contraction" for words with apostrophes in them (isn't, I'll, we've, didn't, ...), and use "abbreviation" for a shortened form of a word, such as "etc." or "intro."

Yes, all of the sentences you provided are grammatically correct. They all consist of a sentence with a contraction or a shortened word in each box. The only difference between the three versions is the choice of words used to express the same idea. Overall, the sentences are clear and convey the intended message effectively.