There weren't any trees two years ago. What does it mean (write a synonymous sentence)?

1. Answer: Here you can use the usage of no equals not any or not a to convert synonyms. Answer: There were no trees two years ago. Two years ago, there were no trees here.

2. Knowledge: There are two common negative adverbs in English, namely no and not. Not is often used with the linking verb be, auxiliary verbs and modal verbs to form a standard negative format, such as:?isn't, aren't, wasn't, weren't; don't, doesn't, didn't, won't, haven't, hasn't, hadn't; can't, couldn't, mustn't, needn't, shouldn't, shan't, etc. The usage of no is slightly different. no is equivalent to not?a? or ?not?any, which means that no itself contains the dual functions of not and determiner. It can be connected to an object or predicate in the singular form, or it can also be connected to an object or object with a plural or uncountable meaning. predicative. In special cases, no and gerund can form a prohibitive slogan, such as "No" smoking.

3.?Example sentence:?

①?I?have?no?idea?about?it.?

I don’t understand. (singular not?a)

②?There?is?no?milk?in?the?glass.?

There is no milk in the glass. (uncountable?not?any)