1.we should talk to our parents whenever we can .

1.we should talk to our parents whenever we can .
we should talk to our parents ( ) ( ) ( ) we can .
2.other students joined in other activities.
other students ( ) ( ) ( ) other activities.
3.All the people suggested that he should finish the work first .
All the people ( ) ( ) ( ) finish the work first.
4.we enjoyed ourselves when we sit on the bench singing.
we( ) ( ) ( ) on the bench singing.