现在...

Today I am not working because I am ill
今天，因为我生病了，我没有去工作 （正确）

I am staying at home and resting
我一直在家里休息 / 我在家停留和待在家里休息

Right now I am drinking green tea while watching TV.
我边和喝绿茶边看电视

I am too tired to play on my computer because I have a fever (please tell me how to translate it in ONLY ONE SENTENCE, I cannot translate it in Chinese with only one sentence )
因为我很热发烧了，我累了 所以我不能在电脑上玩游戏

I have had nearly nothing to eat for three days but I am not hungry
我三天几乎什么都没吃 但是我不饿 （正确）

现在...

Today I am not working because I am ill
今天，因为我生病了，我没有去工作
今天，因为我生病了，所以没有去工作。

I am staying at home and resting
我一直在家里休息 / 我在家停留和休息

我一直在家里休息/我待在家里休息。

Right now I am drinking green tea while watching TV.
我边和绿茶边看电视
我边喝绿茶边看电视。

I am too tired to play on my computer because I have a fever (please tell me how to translate it in ONLY ONE SENTENCE, I cannot translate it in Chinese with only one sentence )
因为我很热，我累了 所以我不能在电脑上玩游戏

因为我感觉很热也很累，所以我不想再电脑上玩游戏。

I have had nearly nothing to eat for three days but I am not hungry
我三天几乎什么都没吃 但是我不饿

我已经三天没有吃什么东西了，但是不觉得饿。

现在...

Today I am not working because I am ill
今天，因为我生病了，我没有去工作 More accurately, 今天，生病了所以我没有去工作

I am staying at home and resting
我一直This means that you didn't leave home before you were sick 在家里休息 / 我在家停留和休息

Right now I am drinking green tea while watching TV.
現在我一边喝和绿茶一边看电视

I am too tired to play on my computer because I have a fever (please tell me how to translate it in ONLY ONE SENTENCE, I cannot translate it in Chinese with only one sentence )
因为我很热，我累了 所以我不能在电脑上玩游 戏This means "I am hot, I am tired and so I cannot play computer games"  发燒了所以太累, 不能玩电脑游 戏

I have had nearly did not  nothing to eat anything for three days but I am not hungry
我三天几乎什么都没有吃 但是我不饿