改错：Although Tom is busy,but he often helps us with our study
问题描述：
改错：Although Tom is busy,but he often helps us with our study
答
Although Tom is busy, he often helps us with our study.
Tom is busy,but he often helps us with our study.
注：尽管和但是，因为和所以，在英语中不能同时出现。
答
去掉 but
although 不能与but一起用的：）
）