In the same way as it is used now.
what has sulfur been used in the past?what has sulfur been used in the past?
Yes it has been successful in the past
what has sulfur been used in the past?what has sulfur been used in the past?
Have been is present tense and had been is past tense.
They all have the same probability, even though in the past some have been drawn more often than others. It's still completely random though!
Have been or Has been IS the past participle......it is equivalent to "was".
Yes it has been successful in the past
Have is used for present and Have been is used for past continous.
A "p" is used for probability of success. A "q" is used for probability of failure.
If he or she has not been neutered then yes, that is indeed a possibility. EVen a probability. It is what they do.
Used (e.g "It had been used for...", "John was used", etc.)
It is the past participle of "be," to exist.