Design CFG for $($Natural Language$)$ interrogative and negative sentences

Test for various sentences such as:

Who are you?

What is this?

You should not eat this food

Why didn't you report

Required Deliverables

Complete CFG

Leftmost and rightmost trees to show that $CFG$ is unambiguous

make lmt and rmt parse trees for each part in the question and further state its unambiguous or not. Answer in detail. State production rules as well. The answer should be well defined and understandable.