Grammar exercise 3 of 3 语法练习3
Use 了、过 as “Using 了 (le) and 过 (guò) in Chinese grammar” explains it, through 13 items over 5 of its example sentences: fill the gap where the word was taken out, and put the words of each sentence back in order.
Using 了 (le) and 过 (guò) in Chinese grammar
13 items. Each one you miss comes back later in the same sitting.