Which Vs That. In non-defining clauses use which. If it does use that.
Use that to introduce a restrictive necessary clause. If you can remove the clause without destroying the meaning of the sentence the clause is nonessential and you. The food store that I go to all the time is closed today.
With restrictive clauses and which.
While some writers seem to have abandoned the distinction entirely no better rule has come along to replace the traditional rule. If you dont use a comma use that. Use that to introduce a restrictive necessary clause. With restrictive clauses and which.