Yes, 'it is thundering outside' shows acceptable grammar.
Yes, 'you were correct' is perfect grammar. An example sentence: You were correct when you said that a tomato is a fruit.
No, "Is was able to confirmed" is not correct grammar. The correct phrase would be "It was able to be confirmed."
It is not correct to say "they has studied". The correct way is to say "they have studied." There are many different places that a person can check grammar questions such as English grammar websites.
Correct grammar is Bob and I but most people use causal grammer and you and Bob is OK.
Both are correct with different meaning.
Yes, that is correct grammar.
Yes, 'you were correct' is perfect grammar. An example sentence: You were correct when you said that a tomato is a fruit.
This should say, The next stop will be somewhere in Vasayas, then it will be correct grammar. Written as it is it is not on correct grammar.
No, it is not correct
No, "Is was able to confirmed" is not correct grammar. The correct phrase would be "It was able to be confirmed."
Yes
Absolutely.
No, The correct grammar for this sentence would be, "He finished doing his homework."
It is not correct to say "they has studied". The correct way is to say "they have studied." There are many different places that a person can check grammar questions such as English grammar websites.
Yes, it is correct to say out of compliance with. It means out of help with in English grammar.
Correct grammar is Bob and I but most people use causal grammer and you and Bob is OK.
Sure.