बहुत अच्छा, बहुत बढिया, अति सुंदर, अति प्रशंसनीय
Mera bahut achha dost. That is how you say good friend in Hindi.
"shubh deepawali" is the way to say Happy diwali in hindi.
In Hindi, you can say "अलविदा" (Alvida) to say goodbye.
suprabhat
Good morning can be said as 'SU PRABHAT' in Hindi. Here prabhat is morning.
Gulaabi. [It is an Urdu word, actually, but used very commonly in Hindi.]
Shubh Ratri
In India, "good-bye" can be said as "Alvida" in Hindi or "Namaste" as a more informal way of bidding farewell.
The word tomato in hindi can be translated as 'TAMATAR'. It is a vegetable very common in india.
"आज तुम्हारा दिन कैसा रहा?" (Aaj tumhara din kaisa raha?)
Maa Acchi hai
You can say "अच्छे वीकेंड की शुभकामनाएं" (acche weekend ki shubhkaamnaayein) in Hindi to wish someone to have a good weekend.