He forgot to feed the fish.

他忘记了哺育鱼。

We need to feed the fish regularly.

我们需要定时喂食鱼。

Does your brother feed the fish every day?

你哥哥（弟弟）每天喂鱼吗?。

I am going to feed the fish this afternoon.

我明天打算在外面用餐。

You feed the fish once only and monitor the fish eating all the food within 2 mins.

你每天哺养鱼一次和监测鱼能在2分钟内吃所有食物。

'One of the things we've been teaching the students is how to feed the fish and not overfeed the fish.

我们已经给学生传授的技能之一就是如何喂鱼，如何不过量喂养。