And now i don't know what does the replier meant by "both are non assertive sentences". I don't have any idea about what rules each one of the types of sentences follow. So i think i need some basic indepth grammar information to understand the fundementals of grammar. Please if someone can help me with such basic rules (but in depth) send me some links to the source or send a post.
There is no requirement in those sentences to use either one or the other form of dare.
You are free to choose whichever you like, because both are in non-assertive clauses (questions, negatives, or hypotheticals in form or meaning).
If you dare breathe a word / If you dare to breathe a word
None dare speak freely / None dares to speak freely
The assertive form almost always occurs with the full verb.
He dares to speak up in class (and so do I).
*He dare speak up in class (and so dare I).
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.