Составьте предложения,: 1)sure/you/am/enough/to/i/seriousness/are/old/the/problem/understand/that/of/the. 2)watch/not/a/nothing/tv/there/video/why/if/on/is/interesting/film. 3)managed/last/her/what/out/happened/i/at/to/find/had/really/to.

1)I am sure that you are old enough to understand the seriousness of the problem 

2)If there is nothing interesting on TV ,why not watch a video-film (насчет этого я неуверен )

3)At last I managed to find out what really had happened to her