This area has a high concentration of computer-related companies

[Urarina]

Hello everyone,

I'd like to ask what is the correct verb and also which is the main subject for verb in question for sentence below:

This area has a high concentration of computer-related companies that make/s silicon chips

Question: 1. Which one is the correct verb, is it "make" or "makes"?
2. Which one is actually the subject for the verb in question (make/s), is it "companies" or "a high concentration" or even something else?

Thank you.

 

[jutfrank]

Hi, Urarina. Since this is your first question, perhaps you could tell us what you think the answer is.

To find the subject, think about exactly what is doing the 'making'.