Grammar exercises: How to use 对 (duì) and 跟 (gēn) as prepositions in Chinese grammar 语法:跟、对 练习
The example sentences of the article, a few to an exercise, in the order the article shows them. Each exercise takes the point's word out of a sentence for you to fill back in, then gives you the sentence's words to put in order, and an item you miss comes back later in the same sitting.
4 grammar exercises over 47 items.