No difference in intent. For the difference between simple past and present perfect, see any of the innumerable threads on the topic, or google each phrase.

It generally does not work. The links you offer seem to discuss advertising slogans, where anything goes: I'm loving it. Hamm's...since 1927 .

I'm sure that if he were writing it down, he would use the simple past. When we're speaking, we don't usually self-edit before we speak. As you know, you don't use present perfect with a specific time reference.

Can "since" be used with the simple present tense? I searched for topics regarding this question, and strangely, I found two different answers from the same person. http://www.englishforums.com/English/SimplePresentSince/dbzcx/post.htm

Sorry, yes: I meant A and D, the simple present. Thanks, Michal.

Hi MM, however, the phrase 'as soon as' (which really means 'at almost the same time that') makes the simple present sound much better than the perfect aspect in your second example You're absolutely right about that. I just

I agree with Michal's first post in his analysis of the verb forms; however, the phrase 'as soon as' (which really means 'at almost the same time that') makes the simple present sound much better than the perfect aspect in your second example, and

Hi Michals, OK, I've got you. Thanks for the reply. Though, I would just causually use the simple present tense in the context. Of course, present perfect is a grammatically viable option.

Hi Dimsumexpress, I couldn't agree more. However, here (that is in so called Time Clauses ) Present Perfect has quite a different role than in your examples and what I think it does is emphasize that one action must be completed before

2. If two or more are possible, is there a diffence in meaning between the correct tenses? Very little. Present Perfect gives additional emphasis that one action must be completed before another one takes place. Michals, I am not sure if I