What is the past tense of the verb "to lie" (not tell the truth)?

The correct choice is indeed "lied," which represents the past tense of the verb "to lie" when referring to not telling the truth. In English, the verb "to lie" has two main meanings: one is to recline, and the other is to tell an untruth. In this context, since the question specifies "not tell the truth," we're focusing on the second meaning.

The verb forms are as follows: the base form is "lie," the past tense is "lied," and the past participle is also "lied." This follows the regular conjugation pattern for verbs that add "-ed" to form the past tense.

When considering the other choices, "laid" is the past tense form of "to lay," which means to place something down; it is often confused with "to lie," but they are different verbs. "Lies" is the present tense form of "to lie," which means being in a reclining position. Finally, "Leid" is not a recognized form of the verb in standard English usage. Thus, "lied" stands out as the correct answer based on the definitions and grammatical rules relevant to the verb in question.