Those people who ___________ remain on outdoor shooting. (future tense)
a) Has to
b) Will has to
c) Had to
d) Will have to

Hint: We can see that we have to find out the correct tense of the words given in brackets. A future tense is something that one is yet to do/perform/carry out. It has not been done yet. Future tenses have the words “will”, “shall”, in it.

Complete answer:
Option a is “has to”. If we use it in the sentence, it does not make sense because “has” is a word used with a singular noun. The word “people” is a plural noun. Therefore, the option is incorrect.
Option b is “will has to”. This is incorrect because of the usage of “has”. Just because it has the word “will” in it and it is in the future tense, does not mean it is the correct answer.
Option c is “had to”. Had to is in the past tense. If we “had to” do something, it means we are talking about something we should have done in the past. Therefore, this answer is also wrong.
Option d is “will have to” is the correct answer. It contains the future form, that is, “will”. Also, the word “have” has been used which is the correct form of helping verb to be used with the plural noun “people”.

Note:
It is possible that students get confused between option b and d because they both contain the future tense “will”. However, we also need to keep a note of the form of the helping verb used. Thus, use the option given in the sentence to make sure the sentence is grammatically correct.