I think that we should act now.

我认为我们应该立即行动。

We must act now, it's now or never.

我们必须现在行动，机不可失。

We can't delay any longer; we must act now.

我们不能再拖延了，必须马上行动。

This is the prima reason why we need to act now.

这是我们现在需要行动的主要的原因。

Everyone should act now to separate rubbish into different groups.

每个人现在都应该行动起来，把垃圾分类。

So act now and learn to act!

因此现在表演和学习表演！

So we need to act now.

我们需要立刻行动起来。

You can drop the act now.

你现在可以不用演戏了。

It is imperative to act now.

如今必需举动起来。

So why still hesitate? Act now!

还犹豫什么呢？快快行动吧！