3.
A: He didn¡¯t go to work today.
B: Really? He
sick.
A: He didn¡¯t go to work today.
B: Really? He
must
be
sick.
A: ±×»ç¶÷ ¿À´Ã ȸ»ç¿¡ ¾È°¬¾î¿ä.
B: Á¤¸»? ºÐ¸íÈ÷ ¾ÆÇ °Å¿¹¿ä.