Certainly. 'Reason told her that she ought not to marry him, but her heart urged her on.'
No, you cannot start a sentence with "no" unless you need to do so. No reason exists not to start a sentence with that word, as you can see. No one will care if you do start a sentence with it.
You start a sentence with whatever word you need to start it with. A sentence can start with "A" if it needs to. A sentence just needs to make sense.
Yes, but only when the sentence is cause and effect.
No reason why not - if writing a sentence you may put a comma after the word. 'Generally, it does not take much time'
Starting a sentence with "for" is not necessarily improper, but it may make the sentence sound more formal or structured. It can be used to introduce a reason or explanation in the sentence. However, overusing it may affect the flow of the writing.
Both are correct, in different context and with different sentence structure. For example: For this reason she left early; but This is the reason why she left early.
The sentence "That was the reason why he came late" is a complex sentence, as it contains an independent clause ("That was the reason") and a dependent clause ("why he came late").
Yes, I can start a sentence with "Is."
According to standard American English grammar, "but" is not an acceptable word to start a sentence with - it is a conjunction to be used in the middle of a sentence. However, in sloppy American useage, many people do start sentences with "but" when speaking. In general, you should avoid starting sentences with "but" unless there is a specific reason (such as colloquial dialogue). Alternative words for "but" at the start of the sentence include "however", "alternatively", "conversely" and "nevertheless". These are adverbs and are acceptable beginning words.
Yes, you can start a sentence with a verb.
Yes, you can start a sentence with an acronym.
You can start a sentence with "Also"