Where和Select的（T，int）重载是否有LINQ语法？

var q = from elem in collection
        where someCondition(elem)
        select elem;

var q = collection.Where(elem => someCondition(elem));

var q = collection.Where((elem, index) => someCondition(elem, index));

var q = from elem in collection.Select((x,i) => new {x,i})
        where someCondition(elem.x,elem.i)
        select elem.x;