Could

Perhaps you mistake the persons?

If he had studied harder, he could have passed the entrance exam and be enjoying college now.

Oops! Right, that was my mistake. Could you please fix it for me (and then delete this message).

Thanks.

No—then I would have to delete my message. It is no great shame. I make typos all the time and find them years later.

So the last 'could' be omitted. Good.

Related questions, MM.

·What is the difference between '(could) enjoy ...' and '(could) be enjoying'? Why do you think the progressive is better?
·Does 'enjoy one's college life' sound unnatural?

Mister MicawberNo—then I would have to delete my message. It is no great shame. I make typos all the time and find them years later.

I thought after the correction, you could delete 'Perhaps..' part.

·What is the difference between '(could) enjoy ...' and '(could) be enjoying'? Why do you think the progressive is better?- Because you said 'now'.
·Does 'enjoy one's college life' sound unnatural?-- Not the best choice here.

Mister Micawber·What is the difference between '(could) enjoy ...' and '(could) be enjoying'? Why do you think the progressive is better?- Because you said 'now'.

OK.

Just out of interest, if the sentence didn't have 'now' as this:

If he had studied harder, he could have passed the entrance exam and enjoy his college life.

In the first sentence you are essentially saying: "He could have passed the entrance exam and he could enjoy his college life." This is ungrammatical (this really grates on the ear, in fact). The sentence, "He could enjoy his college life.", is only used if the person is already in college. Whereas the sentence, "He could be enjoying his college life.", can be used if the person is in college

'Enjoying his college life' sounds like many of my Japanese students.
'Enjoying college life' and 'enjoying college' sound native.

Maybe some of the people I know are your students.

Thanks, MM.