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This question already has an answer here:

On another stackexchange site, I used the following phrasing:

I want to do X. It seems I can only do so when Y.

Someone edited the second sentence:

It seems that I can only do so when Y.

This made me realise that the edited form is perhaps more common -- but is my original phrasing grammatically incorrect? What role does "that" play in the second variation?

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marked as duplicate by tchrist, RegDwigнt Jan 18 '14 at 23:25

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

This has less to do with the phrase it seems than with the omission of that in general. Look up "omission of that" in Google Search. e.g., books.google.co.in/… -- englishforums.com/English/OmissionSubordinateConjunction/bhzhh/… – Kris May 16 '13 at 12:43
Related: english.stackexchange.com/q/8145/14666 – Kris May 16 '13 at 12:45
Ok, I now understand my real question better. But neither the other answer nor any of my google results explain the rules in terms I can understand. :( – starwed May 16 '13 at 12:50
@starwed But perhaps you can rephrase the question now that you understand the issue better? – TrevorD May 16 '13 at 12:53
Also @TrevorD This question is better asked on ELL it seems. – Kris May 16 '13 at 12:54

One use of the word that is as a complementizer, a part of speech that is a type of subordinating conjunction in traditional grammars. Complementizers introduce complement clauses, which are sentential clauses that may or may not stand alone and are the argument of the main verb:

  • I believe that she is a good person.
  • It seems that he can perform miracles.

In other words, the clause she is a good person (which stands alone as a valid sentence), is the argument of the verb believe. The argument of this use of believe is a complement clause, and so may optionally be introduced by the complementizer that.

When that is used as a complementizer, it is optional. Omitting or including the that complementizer is a stylistic decision. Here is a good article that can help elucidate the factors that go into the decision (also available as a podcast at the same link).

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Yes. A That-Complement is one of the four types of English Complement Clauses. The that is required only when the clause begins the sentence, where it's needed to mark a detour to a subordinate clause for the parser. That he was late is unfortunate vs *He was late is unfortunate. – John Lawler May 16 '13 at 14:47

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