除引導名詞子句作受詞外,if(如果)也可用來引導「副詞子句」來表示主要子句的條件。 用法 If + S + V ..., S +(will)+ V ... = S +(will)+ V ... if + S + V ...例句 If it is windy tomorrow, we’ll fly a kite in the park. = We’ll fly a kite in the park if it is windy tomorrow. (如果明天風大,我們就會去公園放風箏。)