Identify the incorrect sentence.
a) Amanda worked diligently on her algebra homework.
b) Trudy bought a American-made car.
c) My sister angrily slammed the door.
d) You should concentrate closely on whatever you write.
The incorrect sentence is b) Trudy bought a American-made car.
It should be: Trudy bought an American-made car.
To identify the incorrect sentence, we need to carefully analyze each option and look for any grammatical errors or inconsistencies.
a) "Amanda worked diligently on her algebra homework." - This sentence is grammatically correct, where the subject ("Amanda") performed the verb ("worked") diligently on her algebra homework.
b) "Trudy bought a American-made car." - The grammatical error in this sentence is the incorrect usage of the indefinite article "a" before "American-made car." Since the word "American" begins with a vowel sound, it should be preceded by the indefinite article "an," making the correct sentence read: "Trudy bought an American-made car."
c) "My sister angrily slammed the door." - This sentence is grammatically correct, where the subject ("my sister") performed the verb ("slammed") angrily.
d) "You should concentrate closely on whatever you write." - This sentence is grammatically correct, where the subject ("you") is advised to concentrate closely on whatever they write.
Therefore, the incorrect sentence is option b) "Trudy bought a American-made car," as it should be corrected to "Trudy bought an American-made car."