Combining Prayers
1 ). Yes, your can pray your missed Salah of Asr and Maghrib with Isha. It is better to Pray Isha first, and then make up your missed Salah. 2 ). For combining of prayers (Zuhr and Asr & Maghrib and Isha), you have to use your best judgement in all honesty. There is no black and white rule in this regard.