I have a meeting soon.
        I have an engagement soon.
        I have an engagement very shortly.
        I have an date very shortly.

　　 I think I'd better go now.
         I think I should go now.
         I think I ought to go now.
         I think I must go now.

　　It's getting dark.
        It's getting dark outside.

　　I've to go quite soon.
        I must go quite soon.
        I must leave quite soon.
        I've got to go leave in a few minutes.

　　It was fun to get together again.
        It was exciting to get together again.
        It was exciting to talk to each other.