Correct Usage:
* There has come a time.
Explanation:
* "There has" is the correct present perfect tense to indicate that a situation or event has occurred at some point in the past and continues to be relevant in the present.
* "Come" is a past participle used to form the present perfect tense of the verb "to come."
* "A time" is the singular noun representing the specific time that has arrived.
Common Mistakes:
* "There have come a time" is incorrect because "have" is used with plural subjects, and "a time" is singular.
* "There has time" is incorrect because it's missing a verb after "has."
Example:
* There has come a time when we must face the truth.