My teacher gave interesting assignments and motivating the students.

很显着，这归于混用语法规划的一个典型差错。这会使语句发生歧义：莫非是说My teacher gave interesting and motivating assignments to the students? 因为本句中 interesting和motivating 是平行规划.

或许是My teacher gave interesting assignments and motivated the students? 因为亦可以了解成gave和 motivated是平行规划.所以差错运用语法会带来许多意想不到的费事。

当咱们重复运用一个短语或单词的时分，不只会给人以词汇量过小的感触，有时甚至也会构成误解。咱们来看一个比方：

My teacher wrote the assignment on the chalkboard. The assignment was on the chalkboard until the teacher erased the assignment after we had all done the assignment.实际上这句话的观念会愈加清楚，假定咱们将重复的词替换为其他表达的话。咱们再来看看改进后的表达：

My teacher wrote the assignment on the chalkboard. She erased the board after we had all completed the task.

其间 assignment 被替换为 task; teacher 变为了she; chalkboard 被改

为了board. 不但语句显得愈加生动生动不呆板，信息量也比正本要多了。

避免新托福口语考试的典型差错，可以做到触类旁通，活络使用，信赖托福口语备考中的其他疑问就能便利的处置了。