Is memento omnia tempus habent in latin a correct sentence?

Answer 1

Memento omnia tempus habent can be literally translated as "Remember all things have their time."

Normally, when the thing to be remembered is expressed using a verb (as opposed to a noun, as in "Remember the Alamo", or a pronoun, as in "Remember me"), it appears as

• a clause introduced by cum or quod ("Remember when/that . . .")
• an interrogative clause (e.g., "Remember how many . . .")
• what is known as the "accusative + infinitive" construction

The Accusative + Infinitive, which often substitutes in Latin for the English "that" clause, is what would be used in this case:

Memento omnia tempus habere: literally "remember all things to have [their] time"

In the question, memento is used as an interjection, and the thing remembered is a simple indicative sentence, with no grammatical connection between the two. This usage does occur in Latin, but appears to be restricted to colloquial and poetic registers. Cicero uses it, but only in his letters to friends, not in his orations; it also occurs, for example, in the poetry of Propertius.