The auxiliary verb "do" cannot be used in Arabic to form a question

It doesn't have an equivalent in Arabic. The Arabic sentence's structure is diff. from that of the English. Do is a helping verb and we don't need that in Arabic.

for example:how to say in Arabic (what do they want?)and explain that please. the answer will be like this:ماذا أرادوا؟ or ماذا أراد هم؟ ماذا=what اراد=want هم=(pronoun for group of male)they أرادوا=أراد همwith conjugation هم أرادوا the real version of conjugation I hope that will help and you're welcome btw we don't use ماذا اراد هم؟ at all only when we want the person to understand so don't use it

Hello there do not translate English to Arabic it's not useful at all forget English when you study Arabic instead you can ask how to say this(type the phrase in English)it is much more helpful you can also ask for the English translation for the Arabic phrase that you get

Do they help . the question is about if the verb " help " is it done or not , here you can use هل ساعدوا ؟ or أساعدوا ؟ Where do they go . the question is not about the verb . they go for sure the question is where . so you don't translate "do" أين ذهبوا How many hours do they study . same is here you don't ask about the verb study you want to know the hours , so you don't translate " do " كم ساعة درسوا ? What do they refuse . same here it is not about the verb "refuse" itself . don't translate "do " ماذا رفضوا ؟ when do they play . don't translate " do " متى لعبوا ؟ hope this help