be careful that-clause and be careful wh-clause

  1. I’ll be more careful what I say in the future.
  2. We were very careful that he didn’t find out.

The that-clause in sentence 2 is a complement of the adjective careful. The wh-clause in sentence 1 seems to be a noun phrase, rather than an embedded question, which I’m not sure of. Either way, I think the wh-clause serves a similar purpose as the th-clause does.

My question is, why is there no preposition governing the wh-clause?

Answer

Attribution
Source : Link , Question Author : Gestaltfilter , Answer Author : Community

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