The task is to fill in the blank in the sentence given, with the right answer from options:
The doctor recommended that she ___________________in bed for a few days.
A) Will stay
B) Stay
C) Would stay
D) To stay

Hint: There is a given list of verbs that can be found among the given options. We need to check the tense the sentence is said in. Since in the given sentence the first verb is simple past tense, once we understand the meaning behind the sentence, the only right option would be to complete the blank with the next verb in its simple present form.

Complete answer:
Read the given question and the four options carefully, then we will figure out which options suit better and which we can omit. We are looking for an option which will give a simple present tense because it is an advice that the doctor has given in the past which is indicated by ‘recommended’.
From the given options, let us see the rights and wrongs of each option:
A) For option (A) will stay; this is an incorrect option because, here ‘will stay’ is in the future tense and we require a present tense, since we are stating an advice so it has to be followed in the present.
B) For option (B) stay; this is the correct option because, here ‘stay’ is in the simple present form and we needed a present tense. We can confidently take this option of the simple present because no other option gives a present tense and an advice is given for a specific place and time.
C) For option (C) would stay; this is incorrect as here ‘would stay’ is in the past tense, but if the option said ‘should stay’ it would be correct because it suits the advice.
D) For option (D) to stay; this is incorrect since here ‘to stay’ is the infinitive and it does not make sense to have an infinite followed by a subject pronoun ‘she’.

Thus the correct answer is option ‘B’.


Note: Let us write the verb ‘To stay’ in its various tense forms:
- Infinitive: to stay
- Present tense: stay
- Past tense: stayed
- Future tense: will stay
- Present perfect tense: have stayed
- Past perfect tense: had stayed
- Future perfect tense: will have stayed