I have been sent by
the Republic of Germany
since nearly one and a half years during which I used to shorten and combine Zhuhr (Noon) and `Asr (Afternoon) Prayers
at the time of the former prayer in school. However, sometimes I miss `Asr Prayer too and I come back home by the time of the Maghrib (Sunset) Prayer. One of my colleagues said that in my case I am not permitted to combine prayers. I hope you will explain this to me. May Allah benefit you.
You do not have to make up for the prayers that you shortened, delayed, or combined with other prayers, because it is possible that you may be included under the excuse of traveling. However, in future you should pray the four-Rak`ah Salahs in full and offer every Salah (Prayer) on time, because the ruling of travel is no longer applied to you, as you have resolved to stay for more than four days. So you have to perform Salah in congregation if possible and do not pray alone. (Part No. 8; Page No. 156) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.