Question

17．如果你不随身带张地图，会迷路的．You'll get lost if you don't take a map with you．．

Answer 1

分析 You'll get lost if you don't take a map with you．

解答 答案：You'll get lost if you don't take a map with you．结合句意可知用if表示如果，引导的条件状语从句，遵循主将从现的规则，主句主语you，get lost迷路，故You'll get lost，从句主语you，take sth with sb 随身带着…，借助于助动词do构成否定，故答案是You'll get lost if you don't take a map with you．

点评 if表示如果，引导的条件状语从句1、主将从现 （主句为一般将来时，从句为一般现在时）；
eg：If it rains（从句），I will stay at home（主句）．
=I will stay at home if it rains．
2、主句含有情态动词 （must、may、can etc．）从句为一般现在时；
eg：If you drive too fast，you may have an accident．
=You may have an accident if you drive too fast
3、主句为祈使句，从句要用一般现在时态；
eg：Don't play computer games if you don't finish your homework．