Context and familiar particles complete the meaning.
● يُسْأَلُ الطَّالِبُ — The student is questioned.
● لَا تُسْأَلُونَ — You all will not be questioned.
● سَيُقْرَأُ هَذَا الْكِتَابُ — This book will soon be read.
The passive vowel pattern stays visible. لَا negates the statement, while سَـ makes the future meaning explicit.