I have trouble completing sentences
I have trouble completing sentences for selecting the right word for the sentence.
The answer to question 13 is (a) why?
The answer of this 16 (b) Why?
The answer to this 17 (b) Why?

I would be happy if you could give me words that directed you to the right answer.
And tips for a solution
thanks and have a good day

Adam Brasel and James Gips of the School of Management at Boston College in Massachusetts. They noticed that when people fast-forward a DVR, they actually (13 a concentrate – b are concentrating - c are concentrated) intensively on the screen, looking out for the end of the advertising break so that they can get back to their program. This means they may (16 a be paid – b be paying – c have paid) more attention than they would if the advertisement (17 a was playing – b were playing – c had been playing) normally.

Question

I have trouble completing sentences
I have trouble completing sentences for selecting the right word for the sentence.
The answer to question 13 is (a) why?
The answer of this 16 (b) Why?
The answer to this 17 (b) Why?

I would be happy if you could give me words that directed you to the right answer.
And tips for a solution
thanks and have a good day

Adam Brasel and James Gips of the School of Management at Boston College in Massachusetts. They noticed that when people fast-forward a DVR, they actually (13 a concentrate – b are concentrating - c are concentrated) intensively on the screen, looking out for the end of the advertising break so that they can get back to their program. This means they may (16 a be paid – b be paying – c have paid) more attention than they would if the advertisement (17 a was playing – b were playing – c had been playing) normally.

Answer

The key is looking at the context. For 13, the context is "when people fast-forward", which is present indicative tense. Therefore the answer is the present simple "concentrate". Question 16 follows 13, and since 13 is present tense, 16 makes more sense as present tense. In this case, it is the present progressive "be paying," to say what the people are doing while they are concentrating. Question 17 requires the present subjunctive tense, because it is talking about a hypothetical present tense situation in which the advertisement is playing normally. This is not the ACTUAL situation, so the present indicative tense cannot be used.

Answers · 2

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