1)  I gave Ted the massage, but he already knew about it.

=> I needn’t have given Ted the massage, because he already knew about it.

2) The trains couldn’t run because of the snow.

=> The snow prevented the trains from running.

3) I didn’t arrived in time to see him.

=> I wasn’t early enough to see him.

4) I’m sorry I was rude to you yesterday.

=> I apologize for being rude to you yesterday.

#PhamThu990

1) I gave Ted the massage, but the already knew about it ( NEEDN'T) 

-> I needn't have given the message, because he already knew about it.

2) The trains couldn't run because of the snow. (PREVENTED) 

-> The snow prevented the trains from running. 

3) I didn't arrived in time to see him. (ENOUGH)

-> I wasn't early enough to see him.

4, 4) I'm sorry I was rude to you yesterday. (APOLOGIZE)

-> I apologize for being rude to you yesterday.