be to 解释为“将要;将会” 比如: I'm to take a bus there. 我会坐公交车到那里。
He's to visit you. 他会去拜访你的。
go to 解释为“去(做某事)” 比如:Let's go to swim! 让我们去游泳吧!
They went to deal with the problem after being reproved. 在被责骂之后,他们去处理这件事情了。
也解释“去某处” 比如She went to the cinema to meet him. 她到电影院去见他。