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The word “whether” is used when presenting two possibilities, often followed by “or not.” In this sentence, the speaker suggests checking between two outcomes: having a permit or not. “If” is sometimes used informally, but “whether” is more correct in formal grammar, especially before “or not.” Therefore, “whether” is the best answer because it clearly introduces a choice and maintains proper grammatical structure.

The word “when” is used to refer to a definite future time or event. In this sentence, the action of moving will happen at the time the children leave home, which is expected to occur. “If” suggests uncertainty, which does not fit here. Therefore, “when” is correct because it expresses a planned or expected future event rather than a possibility or condition.

The word “when” is used to refer to a specific time or situation. In this sentence, summer is the time when the weather is better. “If” would suggest uncertainty, which is not intended. Therefore, “when” is the correct answer because it clearly connects the time period of summer with the improved weather condition in a logical and natural way.

The word “whether” is used to introduce alternatives or uncertainty between two choices. In this case, the project may be useful or a waste of money. “If” is less formal and not preferred when two options are clearly stated. Therefore, “whether” is correct because it clearly presents a contrast between two possibilities and maintains grammatical accuracy in formal English usage.

The word “if” is used to introduce a condition or possibility. In this sentence, it expresses a hypothetical situation where it would be helpful if they provided more details. “When” suggests certainty, which is not intended here. Therefore, “if” is correct because it reflects a conditional idea rather than a guaranteed or definite event.

The word “whether” is used before “or not” to express two possible outcomes. In this sentence, the tests aim to determine one of two conditions: having the disease or not. “If” is less precise in this structure. Therefore, “whether” is the correct choice because it clearly introduces the alternative possibilities and fits standard grammatical rules.

The word “if” is used to express a condition or possibility. In this sentence, the speaker suggests that their pleasure depends on the person being able to come. “When” would imply certainty, which is not intended. Therefore, “if” is correct because it introduces a conditional situation where the outcome depends on a possibility.

The word “when” is used to refer to a specific point in time. In this sentence, showing the driving licence will happen at the time of collecting the rental car. “If” suggests uncertainty, which is not correct here. Therefore, “when” is the correct answer because it indicates a definite action tied to a specific moment.