The bible clearly states someone should not be speaking in tongues if people don't understand and there is no translator.
Paul said 'if there be no interpreter, let him keep silent in the church and speak to himself and to God.'
There are different schools of thought on this. I went to an Assemblies of God church in middle school where they believed that tongues should be interpreted. I was in a chapel service where a kid spoke in tongues. After a while, when there is no interpretation, the principle, a pastor said he believed that tongue was for personal edification and not intended for the congregation, and just moved on. I think he meant it as correction without being too harsh on him.
But, in the Assemblies of God churches I was a part of, back then at least, if someone spoke in tongues in church that I recall, it was interpreted. I saw that at other churches, too.
Now, I have seen some Charismatic churches where they tell everyone to pray in tongues. The preacher at that A/G I went to would not agree with that.
Some people interpret 'let him keep silent in the church and let him speak to himself and to God' to mean that he should not speak the message out to be interpreted, but that he is allowed to kind of pray out loud, but sort of quietly, in the church. Some of the churches from Holiness movement backgrounds in the US have a practice where people pray out loud at the same time. I have heard this verse used as a defense of the practice:
Acts 4
24 And when they heard that, they lifted up their voice to God with one accord, and said, Lord, thou art God, which hast made heaven, and earth, and the sea, and all that in them is:
I think that's a questionable intepretation of the passage, personally, but it is not something I would want to divide over.
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I prayed about it, for the fact most my family are Pentecostals, they do this, and they claim if you are saved you will do this.[/quote]
There are Trinitarian Pentecostals and Oneness Pentecostals. A congregation about a decade after the Azusa Street Revival started teaching that Jesus is the Father, Son and Holy Ghost. That developed into the Oneness movement, where many of them believe someone has to say 'in Jesus' name' or something similar at your water baptism for you to be saved, and that if you haven't spoken in tongues you aren't saved.
But the vast majority of Pentecostals, about 95% from what I've read, are Trinitarian, and do
not believe that you are not saved if you have not spoken in tongues.
Pentecostals in the US used to call themselves 'Apostolic'. A couple of the early Pentecostal newsletters were called 'The Apostolic Faith.' But after the Oneness movement started, in the US, they called themselves 'Apostolic', and the Trinitarians stopped using the label. A missionary went to South Africa before the Oneness movement and some of the Trinitarian congregations there call themselves Apostolic. And there are now other movements that use the term 'apostolic' nowadays that do not part of oneness Pentecostalism. The largest Oneness denomination is the United Pentecostal Church International.
Usually, no one can identify tongues as a language, which was probably the case in Corinth, also. But there have been accounts of many occasions where individuals did recognize languages spoken 'in tongues', especially at the Azusa Street Revival. There are also people who get the same interpretation. I have known at least three people who got the interpretation to a tongue and someone else gave the same interpretation before they could. There are also cases where one person gets a prophecy and someone else gives it. I've experienced something along those lines, hearing tell give a word of knowledge or part of it for someone as part of a prophecy.
And of course, there are those prophecies you get in one place, go elsewhere and someone else prophesies the same thing. Paul experienced the Spirit testifying in every city that bonds and imprisonment awaited him in Jerusalem.