1 They/not/stop/laugh/show / interesting (because)
=> They couldn't stop laughing because the show was interesting
2 People/know/place/from/letter/ sent. (relative pronoun)
=> People know that place from the letter which was sent.
3 The problems/ complicated/ teacher/explain (too...to)
=> The problems were too complicated for the teacher to explain
4 He/act/well/audience/be moves/ tears (enough...to)
=> He acted well enough for the audiences to be moved to tears
1 They/not/stop/laugh/show / interesting (because)
-> They couldn't stop laughing because the show was interesting.
2 People/know/place/from/letter/ sent. (relative pronoun)
->People knew the place where the letter was sent.
3 The problems/ complicated/ teacher/explain (too...to)
-> The problems were too complicated for the teacher to explain.
4 He/act/well/audience/be moves/ tears (enough...to)
-> He acted well enough for the audiences to be moved to tears.