reply to me

I will reply to every single comment on this video.

shorter

I will reply on Monday.

else

Get back to me.

Come back to me.

回復(fù)的意思

We don't need to physically go anywhere.

Respond（ to someone）

I'm not sure whether respond my girlfriend.

answer

給出回答或方法

I never know what to answer when people ask me.

Let me know

（ Similar to answer）

I'll let you know by the end of week.

Can you let me know if you are able to like this video.