Verb conjugation of "smentire" in Italian

What is the next big crisis in the world. No one knows, but experts believe that it will be weather and water related. There is a growing number of arid areas around the globe and many people are living in those areas.
In order to quickly become successful, one would have to change certain points, at least in my opinion: After 5 months of learning, I have still not found the grammar practice on which I should concentrate.
Thank you for correcting my mistakes. I am really grateful for that and this is exactly what I wanted, I just think about whether something similar exists also in English. I doubt it.