Question

put question tag : remember to switch off the lights and fans before leaving the room​

Answer 1

Remember to switch off the lights and fans before leaving the room, did u?

Answer 2

Answer:

remember to switch off the lights and fans before leaving the room will you?

Explanation:

General rules to put a question tag to a sentence.

• The question tag and the statement need to be in the similar tense.
• Use "helpful verb" and "not" in their contracted forms for the negative question tag.
• A negative question tag must accompany a positive sentence and vice versa.
• Pronouns must always be used in question tags.

here the given sentence says : remember to switch off the lights and fans before leaving the room, this is an act to be taken in future hence the questions tag will make sure that the tense of the sentence is not altered.

thus the correct question tag is : remember to switch off the lights and fans before leaving the room will you?