I need to check up on a few things before I can decide.

我得核实几件事情才能作决定。

Forgetting to check up on expenses.

忘记检查费用。

Now let me check up on you a less.

咱们已经学了第八课，我来检查一下。

We must check up on your statements.

我们必须对你的陈述进行清查。

Check up on someone who looks lonely.

向看起来孤独的人问候。