তুমি না আসা পর্যন্ত আমরা তোমার জন্য অপেক্ষা করতে থাকবো। Translate the sentence into English:
We shall be writing for you until you are ota coming back wall
We shall wait for you until you are coming back
We shall wait for you until you are come back
We shall be waiting for you until you are come back
Correct
Explanation:
Correct Answer is: We shall be waiting for you until you are come back