Hello everyone! Could anyone please explain which structures that always sonfuse me are correct and why? 1. It helps me understand It helps me to understand. 2. I baught a thesaurus to help me improve my writing. I baught a thesaurus to help me to improve my writing. 3. Don't allow bad thoughts keep you up all night long. Don't allow bad thoughts to keep you up all night long. I have a feeling that I should use to in 1th and 3th examples, and in 2nd example the correct sentence is the first one, but I cant find a rule that explains it.