11.   If they can do so before conception, the period of pregnancy will be much less stressful.

12.   Nothing of its kind had ever been done before, and it could have blown up in his face.

13.   One more great feat of arms he did before his fighting ended for ever.

14.   She had never done this before, never felt like this, but she had no thought at all of moving away.

15.   She would go off alone for long walks over the cliffs - something she had never done before in winter.

16.   The special effects in the movie included things that had never been done before.

17.   This had never been done before with a rocket engine.

18.   This is particularly useful if done before leaving for work on hot days.

19.   To watch my body and feel it do things it had never done before was just amazing.

20.   You should always strive to achieve more, however well you have done before.