English grammar is extremely difficult. Punctuation and vocabulary are easy to learn but grammar takes a lot of time and effort. Collective nouns are a case in point. I don't think the Chinese language has collective nouns but English contains myriad. For instance do you know the collective noun for "fish"? It's "school". A school of fish. However that's just the generic collective noun for fish. To make matters even worse each particular species of fish has its own collective noun.
Well... to tell the truth, I've never thought about anything about grammar and I escaped each grammar lesson when I was in college. That's why I know nothing about it and always make mistakes. ^-^ What worse, I don't know many English words even though you said it's easy to learn. And fish? I just care which kind tastes delicious ^-^ But you know what? I think you would be a great grammar teacher, Bob ^-^
Thanks for the compliment but I am happy in retirement.
Hehe, I'm not going to hire you even though I know you would be a great teacher. I'm not rich enough^-^ So don't worry about that, Bob. And enjoy your days
I'm sure you richer than I am HERBEAT. You have a job with an income. I am just an unemployable old man with no pension and no regular income. Perhaps you should take pitty on me and offer me a job.