Envier

[Crack1]

Je n'ai pas envie, d'ailleurs il est trop tard.

I am not envious though he is very slow.
Have I translated the French sentence correctly into English?

According to the dictionary, the word 'envie' means wish too.

[Frank]

je n'ai pas envie really means that she doesn't feel like doing it (whatever it is), because it's too late.
So you need to switch back to manual mode.

An envie is a wish, when used as a noun. But avoir envie de is a compound verb that means "to feel like".

J'ai envie d'aller danser
Je n'ai pas envie de manger

It can be followed by a noun, also:

J'ai envie d'une glace

If you don't explicitely say what you feel like doing (or not), and this is perfectly correct, the context should tell what it refers to.

[Crack1]

You are correct Frank.

I've just looked at my dictionary.
There are so many things I have to learn in French.
I am ashamed about my low standard of French.

1.J'avais envie de dormir.

2.J'avais envie de boire.

3.J'avais envie de manger.

4. J'ai envie de aller à gym.

I feel like going to the gym for training now.
I don't think my fourth sentence is fine.
Please help me.

[Frank]

Hello Crack,

The last one is just missing a "la" : J'ai envie d'aller à la gym.

[Crack1]

Thanks Frank

Hier j'avais envie d'aller à la gym.
Yesterday I felt like going to the gym.

2.Hier je devais d'aller à la gym.
Yesterday I had to go to the gym.
How about my 2 sentence? Is it fine?
[ By the way, you can't say yesterday I must go to the gym. In English people don't use the word 'must' for a past event.]

Frank must work tomorrow.
Frank must work today.
Frank must work yesterday. [ Wrong]
Frank had to work yesterday. [ Correct]

[Frank]

Hier j'avais envie d'aller à la gym.
Yesterday I felt like going to the gym.

Perfect.

Hier je devais d'aller à la gym.
Yesterday I had to go to the gym.

Ok, although saying "Hier j'ai dû aller à la gym" would be more natural.

Frank must work yesterday. [ Wrong]

Well, if a time machine ever becomes a reality, it'll make sense :)

[Crack1]

Yes, I would agree with you.
In French, you ought to write 'le passé compassé' in this context,

I always write and behave like an idiot.