Q: Many languages are spoken world wide. what will be the language to ask questions by angles in grave that, everybody can reply?

A: We have found three opinions concerning this issue.
1 – That they will be questioned in Syriac.
This was the view of al-Balqeeni, as was narrated from him by his student al-Suyooti in his essay Sharh al-Sudoor fi Ahwaal al-Mawta wa’l-Quboor – but he did not give any reliable evidence for that.
2 – That they will be questioned in Arabic.
This was stated by al-Haafiz Ibn Hajar (may Allaah have mercy on him). Evidence of that may be seen in the apparent meaning of the ahaadeeth, because they describe what will happen in al-Barzakh in Arabic, and there is no reason why this should not be true, and Allaah will inspire everyone who is tested in the grave so that he will understand this language and answer in it.
Ibn Hajar (may Allaah have mercy on him) said:
With regard to the questioning by the two angels, the apparent meaning of the saheeh hadeeth is that it will be in Arabic, because it says that they will say to him: “What do you know about this man?” etc. However it may also be understood as meaning that each person will be addressed in his own language. End quote.
Al-Imtaa’ bi’l-Arba’een al-Mutabaayinatu’l-Samaa’ (p. 122).
3 – That he will be questioned in a language that he understands.
This was mentioned by Ibn Hajar as a possibility, as stated above.
This was also stated in fatwas by the Standing Committee, and by Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on them).
It says in Fataawa al-Lajnah al-Daa’imah (3/450): When a person dies and is buried, two angels come to him and ask him about his Lord, his Prophet and his religion in a language that he understands. End quote.
Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) said:
What appears to be the case is that he will be questioned in whatever language he understands. If he is an Arab then he will be questioned in Arabic and if he is a non-Arab then he will be questioned in his own language. End quote.
Sharh al-‘Aqeedah al-Safaareeniyyah (p. 435), Dar al-Watan.
In our opinion it is better to refrain from commenting on that because there is no saheeh text on this issue, and concerning oneself with these details is something which will not benefit the questioner in either religious or worldly terms. It is sufficient for him to believe that he will be questioned in his grave, and to ask Allaah to help him to obey Him and to inspire him with the right answers, and to make him steadfast when he is questioned.