Pronoun case
20a. My best friend and I are going to Hawaii this summer.
20b. My best friend and me are going to Hawaii this summer.
My answer is: is 20a
Yes
Right again! :-)
Correct! The correct sentence is 20a: "My best friend and I are going to Hawaii this summer."
When referring to yourself along with others, it's important to use the correct pronoun case. In this case, "I" is the correct pronoun to use because it is used as the subject of the sentence.
To determine whether to use "I" or "me," you can try removing the other person from the sentence and see if it still sounds correct. So in this case, if you remove "my best friend," you would say "I am going to Hawaii this summer."
On the other hand, if we use "me" instead of "I" in 20b: "My best friend and me are going to Hawaii this summer," and remove "my best friend" from the sentence, it would be "Me am going to Hawaii this summer." That doesn't make sense!
Therefore, 20a is the correct sentence with the appropriate pronoun case.