Allow me to provide some suggested context, from a charismatic viewpoint, for the question of Tongues:
The Baptism in the Holy Spirit
Although every believer has the Holy Spirit living inside him from the moment of conversion, not every believer has been baptized with the Holy Spirit.
The baptism in the Holy Spirit is normally subsequent to, and distinct from, conversion.
Baptism Terminology: Confusion and Clarification–
In the study of Scripture, confusion can arise from misread terminology and misunderstood grammatical constructions; this can occur when distinguishing the Baptism in the Holy Spirit from other baptisms.
To help rectify the misunderstanding, please recognize that in the performance of any baptism, there is always
- The Candidate who is to be baptized
- The Element in which the baptism occurs
- An Agent who does the baptizing
The New Testament refers to several different baptisms, three of which are:
- Baptism into the Body of Christ (performed by the Holy Spirit, 1 Cor. 12:13)
- Baptism in Water (performed by a human agent)
- Baptism in the Holy Spirit (performed by Jesus Christ)
Of these three, the real confusion comes in differentiating between “Baptism into the Body of Christ”, and “Baptism in the Holy Spirit.” In order to successfully make the distinction, the key question to answer is: “Who is doing the baptizing?”
In the case of the disciples at Pentecost, although the Spirit was already living in them, His supernatural manifestation was not yet flowing out of them (seen through speaking in tongues) until after the Spirit was poured out from on high; until after they were baptized (immersed) in the Spirit.
On the evening of that first day of the week, when the disciples were together, with the doors locked for fear of the Jews, Jesus came and stood among them and said, “Peace be with you!” After he said this, he showed them his hands and side. The disciples were overjoyed when they saw the Lord.
Again Jesus said, “Peace be with you! As the Father has sent me, I am sending you.” And with that he breathed on them and said, "Receive the Holy Spirit.”
This clear impartation to them of the Spirit by Jesus was distinct from their later baptism in the Holy Spirit by Jesus, which he accomplished from on high at Pentecost (Acts 2). In the first experience, there was no manifested outflow of the Spirit; in the second, there was.
Significantly, at Pentecost the Holy Spirit took the visible form of tongues (glossa) of fire. It can be recognized that the Spirit was subsequently flowing out of these disciples by the miraculous speaking in tongues (glossa) --as the Spirit gave them utterance.