A group of people is doing a project for a volunteer organization.
A group of people often work as volunteers.
The fact that people are doing a project for a volunteer organization doesn't imply often work as volunteers.
exists e1 x1 x2 x3 x4 x5.(Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & for(x3,x4) & n_organization(x4) & of(x4,x5) & n_volunteer(x5) & n_project(x3) & of(x1,x2) & n_people(x2) & n_group(x1))
exists e1 s1 x1 x2 x3.(a_often(s1) & Manner(e1,s1) & as(e1,x3) & n_volunteer(x3) & Actor(e1,x1) & v_work(e1) & of(x1,x2) & n_people(x2) & n_group(x1))