Translation of "Watered" in Chinese

- When was the last time you watered the garden?
- When was the last time that you watered the garden?

你最后一次给花园浇水在什么时候？

The flowers in the garden need to be watered.

花园里的花需要浇水。

- I needn't have watered the flowers. Just after I finished, it started raining.
- I need not have watered the flowers. Just after I finished it started raining.

我原本是不需要给花浇水的，我刚浇完就下雨了。

I need not have watered the flowers. Just after I finished it started raining.

我原本是不需要给花浇水的，我刚浇完就下雨了。