46. It is dangerous for us to take the short cut.

⇒ It is dangerous for the short cut to be taken.

47. You need to have your haircut.

⇒ Your hair need to be cut.

48. You must see it to believe it.

⇒ It must be seen to be believed.

49. He wants someone to take some photographs.

⇒ He wants some photographs to be taken by someone.

50. We enjoy writing letters.

⇒ We enjoy letters being written.