As far as communication in Daman and Diu is concerned, you will find natives of the Union Territory speaking more in Marathi, Gujarati and English which are also considered as the official languages of this tourist place. However, Portuguese as

Daman and Diu’s means of communication is deteriorating day by day. Even you will also not find this language getting officially taught in the schools. Last but not least, English is progressively more acknowledged for official purposes as the effective means of communication in Daman and Diu in India.

About Daman and Diu
Basic Facts about Daman and Diu	Daman and Diu Geography
Agriculture of Daman and Diu	Car Hiring in Daman and Diu
Climate of Daman and Diu	Cuisines of Daman and Diu
Culture of Daman and Diu	Festivals of Daman and Diu
Hotel Booking in Daman and Diu	Population Daman and Diu
Sightseeing of Daman and Diu	Communication in Daman and Diu
Religion of Daman and Diu	Transportation in Daman and Diu

About India
States:
Andhra Pradesh	Arunachal Pradesh	Assam
Bihar	Chhattisgarh	Goa
Gujarat	Haryana	Himachal Pradesh
Jammu and Kashmir	Jharkhand	Karnataka
Kerala	Madhya Pradesh	Maharashtra
Manipur	Meghalaya	Mizoram
Nagaland	Orissa	Punjab
Rajasthan	Sikkim	Tamil Nadu
Tripura	Uttar Pradesh	Uttarakhand
West Bengal
Union Territories:

Andaman and Nicobar Islands	Chandigarh
Dadra and Nagar Haveli	Daman and Diu
Lakshadweep	National Capital Territory of Delhi
Puducherry