题目内容：

英语造句:fall belind和fall over

优质解答

fall behind 1.落后,跟不上.Some students become depressed because they fall behind.一些学生因为落后而变得抑郁（消沉）.fall over:摔倒.If I walk too quick I will fall over.如果我走得太快,我会摔倒....