I totally forgot about that.

我完全忘记了。

totally

完全的；全部地

completely;absolutely

This behaviour is totally unacceptable.

这种行为是完全不能 接受的。

I totally agree with you.

我完全赞同你。

A:Sally,don't forget that we have a neighborhood committee meeting tonight.

莎莉，别忘了我们今晚居委会要开会。

B:Oh!I totally forgot about that.

哦！我都完全忘了这回事。

A:Aren't you glad that I reminded you?

你难道不庆幸我提醒你吗？

B:Yes.Thanks a million,Tom.

是的。万分感谢，汤姆。

A:I think we are going to talk about buying new playground equipment tonight.

我想我们今晚要谈的是给运动场添置新器材的事情。

B:Yes,that's right.We need it badly.

是的，你说得对。我们非常需要新器材。

A:Indeed.So see you tonight.

确实如此。那么今晚见。

B:See you then.

到时候见。