The sentence which expresses a prayer, keen wish, curse etc. is called an optative sentence. This kind of sentence generally starts with ‘may’ and ‘wish’. Sometimes, ‘may’ remains hidden. Here, for given sentence, speaker is expressing a blessing that they live long to see their grandchildren. All other given options are inappropriate. So, the correct answer will be: Given sentence is an optative sentence.

The given sentence is in complex form. For changing the sentence from complex to simple form we should remember to change the subordinate clause into a word or a phrase. Here, for the given sentence, the subordinate clause (what he said) is substituted by the phrase ‘the meaning of his words’. All other given options are inappropriate. So, the correct answer will be: We could not make out the meaning of his words.

The correct answer is option A, i.e., must. Words used before verbs to give extra information about them and expresses ability, likelihood; capacity, request etc., are called modal auxiliaries. Example, can, might, may, could etc. The sentence in the question shows necessity which is expressed by the word “must”.

The complete sentence with appropriate modal is: Priya spoke very well. She must have prepared in advance for her talk. The modal ‘must’ is used in the sentence to indicate possibility.

To convert the direct speech to indirect speech, we will remove comma and quotation marks. We will also convert:

• I^st person pronoun (I)--III^rd person pronoun(she)

• Simple Present (do)--Simple Past (did)

• II^nd person pronoun (you)--I^st person pronoun (me)

Remember, the pronouns of direct speech get changed, where necessary, to indicate the relationship with the reporter and the hearer clearly.

So, the correct answer is: Sanya told me that she didn’t believe me.