It isn’t necessary to book a table at the restaurant.

It is not necessary for you to finish the work today.

Jack lacks the necessary skills for his job

Keeping the environment clean is very important.

I think his career is more important to him than I am.

It's important for children to learn to get on with each other.

The important thing is to keep the heat low or the sugar will burn.

necessary

1 It is  necessary to drink water everyday

2 my father thinks the bike is necessary for me

3 it is not necessary to have a nice box

important

1 he is important with his family

2 what an important paper !

3 this paper is more important than that one