I haven't been trying to prove or disprove whether or not tongues has ceased... That is something you will have to do for yourself. But Ill be happy to give my opinion.
I think I left the intension of my last post a little unclear. sorry.

I was trying to give you a starting point, instead of giving my explanation.
The events in Acts took place over a 33 year period. All throughout that period the Gifts of Power were in play.... It was Normal Operating Procedure. People did not TRY to speak in tongues, they DID. People did not TRY to heal, they just healed. People did not TRY to raise the dead, they just did. Today, people are TRYING to do all these things AND all of these SIGNS can also be done by, the "other team".
The Gifts of Power were given as a SIGN to Israel in preparation of the Kingdom... Tongues were given to begin the gathering of ALL the Nations of Israel - A reversal of the events at Babel.
Peter was baptized WITH the Holy Spirit (the baptism of Power); there is NO evidence in Acts Paul (the Apostle of grace) received this baptism (although he probably did, the Holy Spirit just didnt feel the need to tell us about it). I do not believe Paul addressed Gentiles by using "signs". He simply preached the gospel to them - and they believed. Signs were given to Israel as proof of the coming kingdom. Just like Christ did in the gospels
a) The ministry during the Gospels did stretch to all nations tongues were not needed.
b) Christ had to equip His Apostles to spread the gospel to all nations
When God stopped dealing with the nation of Israel, the signs ceased.
Act 2:8-16 KJV
(8) And how hear we every man in our own tongue, wherein we were born?
...
(15) For these are not drunken, as ye suppose, seeing it is but the third hour of the day.
(16) But this is that which was spoken by the prophet Joel;
"This, is NOT that" anymore as God's plan for Israel was postponed - I believe the signs ceased in 70ad.
I know there are a few interpretations of WHY tongues have ceased... this simply mine. And Im also aware that I can not PROVE anything to you (which was my point in my previous post), you have to try the things that differ
.
I hope that helps. I would be more than happy to aid you in this study, but I will not try to prove to you that tongues have ceased I simply cant; I can only show you WHO the gift was given to, WHAT is was given for and WHY it was given. The rest is up to you.
1) Who were the "sign gifts" promised to and what were they for?
2) It's obviously *NOT* happening the same as described in Acts, what happened?