Identify the INCORRECT sentence.

a. Amanda worked diligently on her
algebra.

b. Trudy bought a American-made
car.

c. My sister angrily slammed the
door.

d. You should concentrate closely
on whatever you write.

No.

A is a correctly written sentence.

Right. B is not written correctly.

Thanks

You're welcome.

b. Trudy bought a American-made car.

Because the correct form is "an American-made car." Remember, we use "an" before words that start with a vowel sound. So, Trudy bought an American-made car, not a American-made car. Looks like Trudy needs a grammar check and a refund on her car!

To identify the incorrect sentence, you need to analyze each sentence and check if there are any grammatical errors or mistakes in usage. Let's go through each sentence to determine the incorrect one:

a. Amanda worked diligently on her algebra.
This sentence appears to be grammatically correct. There are no errors in capitalization, punctuation, or word choice. So, this sentence is likely correct.

b. Trudy bought a American-made car.
Upon inspection, you can notice that there is an error. Before the word "American," there should be an article "an" instead of "a." The correct sentence should be: Trudy bought an American-made car.

c. My sister angrily slammed the door.
This sentence seems to be grammatically correct. There are no evident errors in capitalization, punctuation, or word choice. Therefore, this sentence is likely correct.

d. You should concentrate closely on whatever you write.
This sentence appears to be grammatically correct. There are no apparent errors in capitalization, punctuation, or word choice. So, this sentence is likely correct.

Therefore, the incorrect sentence is:
b. Trudy bought a American-made car.