- “My grandmother, along with two of her friends, (is/are) planning a trip to Mexico.”
- The summary, plus all these reports, (needs, need) to be typed by tomorrow.
Fill in the gaps please .I am confused about the correct answer. And please explain why?
1 - is. 2 - needs.
Because you've isolated the additional items (your grandmother's friends and the reports) from the item you are talking about, you are effectively talking about a singular item, so you need the singular form of the verb afterwards.
You could have said "My grandmother and two of her friends are..." and "The summary and these reports need...".
Read it this way...
My grandmother, [along with two of her friends], is planning a trip to Mexico
the string in between the commas is additional information.