【语法专练】 一、用 whether, if,when, what,where, why完成下列句子。 1.Lily wants to know John lives. 2.Can you give me some advice on I should tell him the truth? 3. you are ill, you must see a doctor. 4.—Do you know they will come here? —Next Monday. 5.Mr Li can’t understand his son is so mad about iPad.