This Adjective Clauses Using That and Which interactive also includes:
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An online lesson that clearly, if exhaustively, explains when to use "that" or "which" to begin a relative clause, specifies exceptions to the rule, and notes when to set off such clauses with commas. Learners assess their mastery with 12 questions in which they select "commas" or "no commas" and get feedback at the click of a button.