IFEn.内场致放射ifconj.是否；如果；即使；每当n.条件；设想If you are just browsing若您刚才浏览If thou kiss not me?If you catch my drift.如果你了解我的意思的话。if-then decision trees如果--则判别树if memory serves me well如果我记忆力好If It Snows On Christmas圣诞节下雪If it is collect call.若是这样。If the wind blows harder如果刮大风If you lock yourself out如果你无家可归If I leave your world.如果我离开你的世界!