Хотя носители языка иногда говорят о небольшой разнице в употреблении этих прилагательных (и образованных от них наречий), это синонимы. Словари толкуют одно слово через другое.
Более того, incredible - это заимствование из латыни, где приставка переводится как "нет", а корень слова переводится как "верить".
How to make friends at a new school?
Making new friends can be difficult, but it is possible. First of all, when you come to the classroom, give a smile to everybody and say “hello”. In general, pupils like to talk about their hobbies or discuss films. So you can tell them about your favourite actors, movies, hobbies and interests. You should be natural. Also you may ask questions to start a conversation or make a compliment. You can invite pupils to go to the café or to the cinema. If you like sport games, you can make a sport team. It is the best way to make friends.
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Jill:Do you live in a new flat?
Ann:Yes,I do.
Jill:Have you got a room of your own?
Ann:No, I haven't .I share a room with my little sister.
Jill:How many rooms have you got?
Ann:We have got three rooms, a kitchen and a pantry.