英语翻译顺便给几个例句

由某人来决定做某事
It's up to my manager to decide that.

做某事某人说的算
一般只用It`s up to sb就可以
-What do you want to tomorrow?
-It`s up to you
-你明天想做什么？
-你说了算

由某人来决定做某事
It's up to my father to buy it.
希望对你有帮助

1\轮到某人做某事
it's up to him to buy ticket.
2\取决于
It's up to them to decide.

1.可以.
2.固定句型It's up to sb to do sth一般有两种意思：
1）由某人决定去做某事
如：It's up to you to decide how to get there.
由你来决定怎样到达那儿.
2）做某事是某人的义务/职责/责任
如：It's up to her to lock the door.
锁门是她的职责./锁门由她来负责.

不能。
应该翻译成，是由某人决定来做某事。
例句：
It's up to you to decide how to get there.怎么去那里这件事由你决定。
-Where shall we go?
-It' up tp you.
-我们要去哪里？
-你来决定。

能 It's up to us to help them.（帮助他是我们的责任）