Скажите, что это не так. 1. the first pupil runs well. 2. we sing the fourth song. 3. the tenth poem is funny. 4. the second boy can skate well. 5. his third computer is new.

1. The first pupil doesn't run well. 
2. We don't sing the fourth song.
3. The tenth poem isn't funny. 
4. The second boy can't skate well.
5. His third computer isn't new.