1. I don’t want ___ out tonight. I’m tired. (go)2. Why do you keep ___ me questions? Can’t you leave me alone?(ask) 3. The boy’s father promised ___ for the window to be prepared. (pay)

1. I don’t want to go out tonight. I’m tired.
In this sentence, the verb "go" is used in the infinitive form ("to go") after the word "want." The word "to" is necessary in this case because after verbs like "want," we use the infinitive form of the verb.

2. Why do you keep asking me questions? Can’t you leave me alone?
In this sentence, the verb "ask" is used in the gerund form ("asking"). The word "keep" is followed by the gerund form of the verb. "Asking" is a gerund because it is functioning as the object of the verb "keep."

3. The boy’s father promised to pay for the window to be prepared.
In this sentence, there is a structure called a "causative verb." The verb "promise" is used in the past form and is followed by the infinitive form of the verb "pay." Additionally, there is a second verb in the sentence that has been changed to the passive voice. The phrase "to be prepared" is used to show that someone else will do the action of preparing the window. So, the father promised that someone else would prepare the window, and he will pay for it.

I hope this explanation helps you understand the grammar and meaning of these sentences better. Let me know if you have any further questions!