2 Things to remember We can use that to replace who and which in relative clauses like those above.However,who and which are more common in written English,while n年w用4年年g年年sgg年N11144“e4“88::880境 that is more often used in speech. We can leave out who,which or that in a relative clause when it is the object of the verb in the clause. The book (whlch/that)he llkes most ls The Adventures of Tom Sawyer. The writer (who/that)he llkes most ls Mark Twain.2