Final answer:
To convert the sentence 'Ali is going to throw the ball' to passive voice, it becomes 'The ball is going to be thrown by Ali.'
Step-by-step explanation:
- To convert the active sentence 'Ali is going to throw the ball' into passive voice, we start by making the object 'the ball' the subject of the sentence.
- Next, we use a form of the verb 'to be' in the same tense as the original sentence (in this case, 'is going to be') followed by the past participle form of the verb 'thrown'.
- Finally, we add 'by Ali' if we want to indicate who is performing the action.
The passive voice sentence is: 'The ball is going to be thrown by Ali.' Note that in passive constructions, the original subject ('Ali') becomes the agent of the action, often preceded by the preposition 'by.'