These are the basics of what I have learned, that has helped me in my diabetic journey.
Q1) Is the above sentence grammatically correct and natural?
Q2) What does "that has helped me in my diabetic journey" describe in the above sentence?
1. These
2. the basics
3. What
Q3) Is it possible to use "relative pronoun" such as "that" and "which" to modify "what" like in the example?
I think they're all possible options, so I'm not sure which one would be the correct option. Would you please select anything that seems to be right?
fire1 Q1) Is the above sentence grammatically correct and natural? No. These are the basics of what I have learned that have helped me in my diabetic journey.
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fire1Q1) Is the above sentence grammatically correct and natural?
No.
These are the basics of what I have learned that have helped me in my diabetic journey.
The subject is plural.
The comma is incorrect.
"diabetic journey" is not natural. Do you mean "in my struggle against the side effects
fire1Is it possible to use "relative pronoun" such as "that" and "which" to modify "what" like in the example?
The relative clause in your sentence does not modify the what-clause. It modifies 'basics'; however, a relative clause can modify a what-clause:
what I remember that interests me most
CJ