Explanation
The Past tense is used to refer to a completed action in the past but with a clear reference to the specific time of action in the past.
Here in the question, the first person is saying that her mother was helpful while she was staying with them (while here suggests past tense), & the second person is asking what all things she (mother) helped him/her doing. As the reference is being made to an action that happened in the past with reference to specific time period ("while she was staying with us"), therefore the correct tense to use here is Simple Past Tense.
Here the sentence is the question form.
Here the verb is help (root form of the verb).
Here in the question, we see that the second person had visited the doctor and the first person is asking what the doctor told him/her. At the time of speaking the action had already occurred (i.e. the second person visiting the doctor & getting a medical advice), therefore the correct tense to use here is Simple Past Tense.
A sentence of Simple Past Tense in question form is formulated as: did + [subject] + [root form of the verb]
When asking a question with the verb "to be" the formula is : was / were + [subject]
Here the verb is tell (root form of the verb).
Therefore the correct formulation here is : did + she + tell
Therefore the correct complete sentence is:
"What DID SHE TELL you to do?"
Let’s examine the sentence showing the what ‘he thought’: "By the time I get home the story ____ in the evening newspaper." The sentence can be divided into two parts: ‘By the time I get home’ and ‘the story _____ in the evening newspaper.’ The first part shows that the person who is thinking this has not yet reached home and is expecting something to happen by the time he reaches home. The second part shows that whatever he expects to happen is related to the story and the newspaper. The mention of the story and newspaper clearly assumes that the sentence is referring to the action of publishing. Now, as what he expects to happen will happen in a future time, so the second part of the sentence is in future tense and as he presumes that the action will be completed, so the tense is future perfect tense.
The future perfect tense indicates that an action will have been completed (finished or "perfected") at some point in the future. This tense is formed with "will" plus "have" plus the past participle of the verb.
Of the four options, the only option that is meeting the requirement of structure of future perfect tense is Option C. Hence, Option C is the correct answer.
Options A, B and D cannot be used as they would make the sentence grammatically incorrect.
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