Word by Word Analysis

فَهَلْ يَنظُرُونَ إِلَّا ٱلسَّاعَةَ أَن تَأْتِيَهُم بَغْتَةً ۖ فَقَدْ جَآءَ أَشْرَاطُهَا ۚ فَأَنَّىٰ لَهُمْ إِذَا جَآءَتْهُمْ ذِكْرَىٰهُمْ 18

Then do they await except that the Hour should come upon them unexpectedly? But already there have come [some of] its indications. Then how [i.e., what good] to them, when it has come, will be their remembrance?