Interesting collection of words that require additional memorization effort, find it here: http://www.newyorker.com/humor/daily-shouts/a-compiled-list-of-collective-nouns?mbid=social_facebook
I do not endorse teaching grammar without embedding it in a meaningful context, especially in ESL contexts. However, sometimes drilling may assist EFL learners to acquire automatization for the concepts. Here are some APPs to do this: 10 Essential Apps to Help Elementary Students Learn Grammar at http://www.educatorstechnology.com/2017/05/10-essential-apps-to-help-elementary.html?m=1
From Facebook, excerpt:
Missing from the debate over grammar teaching
Sent to the Guardian, May 13, 2017
“I think grammar teaching should start with real examples of language in use: journalism, fiction, songs, ads, instructions, headlines, transcripts of conversations and so on.” (Michael Rosen, “Can split digraphs help children learn to read and write?” May 13, 2017)
Research published in professional journals confirms that Michael Rosen is correct. We absorb, or “acquire” the complex rules of grammar through reading, not through learning complex rules that sometimes even professional linguists find hard to understand.
Studies done over the last 100 years confirm that grammar instruction has no impact on writing and that the amount of reading done, especially self-selected recreational reading, has a profound impact on writing quality. Advocates of intensive grammar instruction for young children are free to disagree with this research but are not free to ignore it.
Michael Rosen’s article: https://www.theguardian.com/…/can-split-digraphs-help-child…
Good talks for English learners