Question

.I __________ this book since morning. ​

Answer 1

Answer:

I am reading this book since morning. 

Explanation:

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Answer 2

I have been reading this book since morning.

In the above solution, we see the usage of the present continuous tense.

• Tenses are words that signify or portray the time or tenure of an activity, event, or phenomenon.
• For example, It rained yesterday. Here, the word 'rained' is in the simple past tense.
• By this, we understand that the phenomenon or event that is being spoken about has already ended and thus, is in the past.

Thus, we understand that the action that is being spoken about in the question has already started, and is still going on. This, present continuous tense should be used.