In English grammar, when discussing duration in possessive forms, it is crucial to understand the proper placement of the possessive apostrophe. Let’s examine each phrase:
- A two days’ visit: This phrase utilizes an incorrect possessive form. The correct format for expressing a possessive duration like this is "two days' visit" without the possessive because the focus is on a singular duration adjective, "two-day," describing the noun "visit."
- A two day’s visit: In this phrase, the apostrophe is incorrectly placed. It suggests that there is only one day possessing something, which is not the intention. Therefore, "two-day visit" would be the correct form with "two-day" acting as a compound adjective describing the noun "visit."
Thus, analyzing both phrases in the options reveals that each contains a grammatical error related to the use of possessive forms for indicating duration, rendering both phrases erroneous.