The correct passive form of the given sentence is:

☀ It is time for the shop to be opened.

 Let's break down the options:

1. The shop should be opened. (Correct) This sentence correctly uses the passive voice and conveys the same meaning as the original sentence. It uses the correct form "should be opened."

2. It is time for opening the shop. (Incorrect) This option is not in the passive voice. It retains the original active construction "It is time for" but adds the gerund "opening." The correct passive form should use "to be opened," as shown in option 1.

3. It is time the shop be open. (Incorrect) This option uses the subjunctive mood "be open," which is not the correct passive form for this context. The correct form should use "to be opened," as shown in option 1.

4. It is time for the shop to be opened. (Correct) This sentence correctly uses the passive voice and conveys the same meaning as the original sentence. It uses the correct form "to be opened" and retains the structure "It is time for" to indicate the necessity of the event.