Question

correct sentence that is an eraser or that is a eraser

Answer 1

your correct answer is:- that is an eraser.
HOPE THIS HELPS!

Answer 2

correct sentence is -  that is an eraser

• two sentences are given . the second sentence is wrong grammatically.
• we use article before a noun, the article - " an " is used before the nouns which start with a vowel . there are five vowels - a, e, i , o and u.
• the noun in the above sentence is eraser which starts with the vowel "e".
• so the article to be used will be an and hence, the first sentence is correct.
• the second sentence uses a wrong article - "a".