Has Geena Davis's Life Changed In Recent Years New Memoir Davis Reflects On The Roles That Shaped Her Npr

Here, i wish to ask a. There are 200 individuals who each have two alleles at single nucleotide site of interest. I'm not sure how to explain the grammar simply.

Geena Davis 'grateful' she waited until her 40s to have children

I have read a similar question here but that one talks about the usage of has/have with reference to anyone. Since there is no other. I am wondering if the following sentence is correct.

Can anyone tell me where we have to use has and where we have to use have?

Can anyone explain me in a simple way? Today my friend asked me if you can use has instead of have here.