• Noun Clauses with That

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• When a noun clause functions as the direct object of a verb*, that can be removed from the sentence.  
  

  
  

  - I didn't know that he could play the ukulele. 

  - I didn't know he could play the ukulele. 
  

  
  

  That can be removed from this sentence because he could play the ukulele functions as the direct object of the verb know.
• *Remember! Mental process verbs (think, know, understand, etc.) are often followed by a direct object noun clause.
•  Click on the play button to hear the audio

• I think (that) we need to send petitions to Congressman Smith.	I believe (that) we should all start using renewable energy.
  I hope (that) tigers will be removed from the endangered species list in the near future.	Jane thinks (that) she wants to become an environmentalist when she's older.

Source : Alison