I am worried;he_ arrived by now.
Answers
I am worried; he should have arrived by now.
Explanation:
According to the first clause, the person is worried about something and it is written in the present tense. So, the tense followed should be of present tense too.
The clauses are divided by ';' which means that the two statements are interrelated. The 'arrived by now' wording gives us an idea about why the person is worried, maybe because of 'his unarraival'.
The situation falls in as "He should have arrived by now, but he isn't". "Should have" falls in the place where one should be there / happened, but didn't.
So, the answer is - "I am worried; he should have arrived by now.
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