This sentence is an example of the present subjunctive, which is most commonly used in English to express hypothetical situations, wishes, and desires. The correct long form of the sentence is “if you were to choose that restaurant,” and “were you to choose that restaurant” is simply an inversion and shortening of the long form. (“Were you to have chosen that restaurant” is the past subjunctive, which doesn’t match the future conditional form of the second half of the sentence.)

The subjunctive verb mood is used when sentences express conditions contrary to fact, or as in this case, in clauses that contain an order or a recommendation. The correct version of this sentence reads: "It is necessary that Danielle know what time she is being picked up."

The word "if" at the beginning of the sentence indicates that the sentence is an indicator that the sentence is in the subjunctive mood. Given that the sentence is subjunctive, the word "was" should be replaced by "were."

The first part of the sentence indicates that the sentence is a wish, therefore, the sentence is in subjunctive mood. "Were" is the correct verb to use with "school" when using the subjunctive mood.

The subjunctive mood is used when a sentence is intended to express doubt or possibility, rather than hard truth. In the sentence above, because the word "regret" is used, we know that the subjunctive should be used. The sentence is correct as it is written. 

The subjunctive mood is used when a sentence is intended to express doubt or possibility, rather than hard truth. In the sentence above, because the word "demanded" is used, we know that the subjunctive should be used. The correct subjunctive construction of the underlined portion above is "be held."

The subjunctive mood is used when a sentence is intended to express doubt or possibility, rather than a hard truth. In the sentence above, because the word "if" begins the sentence, we know that the subjunctive should be used. The correct subjunctive construction of the underlined portion above is "If I were you."

The subjunctive mood is used when a sentence is intended to express doubt or possibility, rather than a hard truth. In the sentence above, because the word "wished" is in the sentence, we know that the subjunctive should be used. The correct subjunctive construction of the underlined portion above is "subordinate were more loyal."

The subjunctive mood is used when a sentence is intended to express doubt or possibility, rather than hard truth. In the sentence above, because the word "requires" precedes the subordinate clause, thus making this a requirement or request for possible future behavior, as opposed to an expression of actual behavior that is occuring. The correct subjunctive construction of the underlined portion above is "everyone be respectful."

The subjunctive mood is used when a sentence is intended to express doubt or possibility, rather than a hard truth. In the sentence above, because the word "insists" precedes the subordinate clause in the second part of the sentence, we know that the subjunctive should be used. The correct subjunctive construction of the underlined portion above is "I be still." The sentence is correct as written.