I need to find out.

我需要查明。

I need to change it.

我需要改变它。

I need to save money.

我需要存钱。

I need to use the net.

我需要用网络。

And now I need to sleep.

现在我需要睡觉了。

I need to buy some soap.

我需要买些肥皂。

I need to buy furniture.

我需要买家具。

I need to prepare dinner.

我需要准备晚餐。

I need to manage my time.

我需要管理我的时间。

I need to clean the house.

我需要把房子打扫一下。