I am trying to learn/improve my English by remembering grammar rules. Every day, I read a lot of technical documentation and have many conversations with my colleagues from US.
I already have many phrase templates, but sometimes I urge myself to stop using this and try to figure out the rules by which a phrase was constructed.
So, how common is the usage of the sentence "I'm not understand". (Understand — is a verb in 1st form used after form of be.)
What rules were used?
Why doesn't it sound like "I don't understand" or "I'm not understanding"?
Best Answer
The phrase "I'm not understand" is constructed... well... badly. It's simply incorrect.
Your two alternatives are correct. You can use do understand or is understanding, but you can't use do understanding or is understand. You use do with the verb in base form, and is with the verb in present participle form.