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I have described how to get the answer with an assumption. After the description, I want to use the following sentence, but I don't know which is correct.

Note that all derivations have been made on the assumption that it is selected as the source node.

vs

Note that all derivations have been made on the assumption that it has been selected as the source node.

vs

Note that all derivations have been made on the assumption that it was selected as the source node.

I think one of these three must be correct. Which one is correct?

5
  • What does the it refer to? Aug 3, 2020 at 12:55
  • @RonaldSole it refers to "the ith node"
    – Danny_Kim
    Aug 3, 2020 at 12:56
  • 1
    Both 1) and 3) are correct.
    – Alex TheBN
    Aug 3, 2020 at 13:37
  • 1
    @AlexRaw Thank you very much.
    – Danny_Kim
    Aug 3, 2020 at 13:38
  • 1
    All three look all right to me.
    – rcook
    Aug 3, 2020 at 14:27

1 Answer 1

1

Assuming that you have specified what the word it refers to, the most concise and clearest option is 1.

Note that all derivations have been made on the assumption that it is selected as the source node.

Number 2 is grammatically correct but takes more words to say the same thing.

Number 3 is possible too but the present perfect passive (have been made) works better with the present (is selected).

So your question is really not about grammar or correctness, but about aptness - which one works best.

In short, prefer 1.

1
  • Thanks. This is what I really want to know.
    – Danny_Kim
    Aug 3, 2020 at 17:45

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