Is the following sentence right or wrong?
"American army is a good team"
what we have to use in this sentence, 'is' or 'are'?
Please advice asap.
Think about the difference between singular nouns and plural nouns. An army is a singular thing, even though it is made up of many elements.
If the sentence read, "American soldiers . . . ." then the next word would be 'are,' because soldiers is a plural noun.
So, the correct answer to your question, is, "The American army is a good team." (You omitted the word 'The' at the beginning of the sentence; it's a bit awkward without it.)