This is a great question, thankfully with a deceptively straightforward answer!
This is an example of a stative passive construction. Stative passives describe a state rather than the result of an action (eventive passive.) Confusion arises because, in English, no distinction is made between the two types of passive construction. Other languages, such as Japanese, make this distinction clear.
You seem to have a few conceptual and terminological confusions. Firstly, this:
Please tell me why I sound like a sissy.
is not a "statement" but rather a "request"; it is not a declarative sentence but an imperative one.
Secondly, it does not have a single "question form"; you can say "Why do I sound like a sissy?", but also "Could you tell me why I sound like a sissy?".
It should be noted that the clause "why I sound like a sissy" is an interrogative content clause (an indirect question), with the corresponding independent clause being "Why do I sound like a sissy?" (a direct question); but just because a sentence includes that clause, it doesn't mean the sentence is a request for information. Consider these:
He asked me why I sound like a sissy.
He offered to tell me why I sound like a sissy.
Thirdly, you are probably selecting the wrong definition of "imply". I'm not sure whether it makes sense to say that a question is "implied", linguistically speaking, by a request for information; but if it does, then the relevant sense of "imply" is surely this one:
to include or involve (something) as a natural or necessary part or result
(from http://www.merriam-webster.com/dictionary/imply).
Linguists generally use the term "entail" rather than "imply", to avoid this ambiguity; where mathematicians say that a statement p "implies" a statement q (meaning that if p is true, then so is q), linguists say that it "entails" it. And it's not hard to extend this notion to commands/requests or questions (e.g., I suppose that "Go talk to him" could be said to entail "Talk to him", in that you can't fulfill the former command without fulfilling the latter); but I'm not sure what exactly it would mean for a command to entail a question, or vice versa.
Best Answer
Well, most of your doubts would be retracted after reading up http://www.englishclub.com/grammar/verbs-m_used-to-do.htm
I would like to summarize the main points from the webpage.
1) We use the used to do expression to talk about: - an activity that we did regularly in the past (like a habit) - a situation that was true in the past
For example,
2) Used or use? - when there is did in the sentence, we say use to (without d) - when there is no did in the sentence, we say used to (with d)
For example,