People did not beleived it worked back then and there is more of a chance now because they are more improved.
"Success" is a noun, therefore it has no tense (and NO Past Tense). Maybe you were thinking of "to succeed"? Its Past Tense is "succeeded".
Success is not a verb and does not have participle forms.
A person's past experience may be a mixture of success and disappointments. A well thought out schedule normally leads to better time management and pleasant interactions.
In terms of recent success (Past 20 years anyway) Manchester united have been far superior than Newcastle
Successful
No, the past is not better or worse. Ofenly people remember more the good/better experiences of the past and repress the bad experience. This makes it seems that the past is better.
the number of persons in the United States developing kidney stones has been increasing over the past 20 years
Remembering past success and failures.
Better us an Adjective, a few have past tense, but most, like better is It was <placewordhere> so just right/type it was better, or improvise.
no.
The word "successful" is an adjective and so doesn't have a past tense. Only verbs have tenses.
no, profit and expansion in a given market are key indicators of success - to go past or overtake your competition is the literal definition.