I typed the following simple sentences into an online interpreter and the results do not seem quite right.
http://www.translate.ru/text.asp#tr_form
Can someone correct these please?

I am sad. I am depressed.
Я грустен. Я угнетен.

I am happy.
Я счастлив.

You are sweet. (Meaning that you are a nice person - not sweet tasting)
Вы сладки.


I always thought that "I am sad" = "Мне грустно".

Thanks