Grammar exercise 1 of 3 语法练习1
Use 的、了、地 as “Video lesson: Four big rules for Chinese grammar (语法 yǔfǎ)” explains it, through 8 items over 6 of its example sentences: fill the gap where the word was taken out, and put the words of each sentence back in order.
Video lesson: Four big rules for Chinese grammar (语法 yǔfǎ)
8 items. Each one you miss comes back later in the same sitting.