Quote Originally Posted by zorro View Post
In one exercise I need to give the past and future of the given sentence. One sentence is Сегодня туман. I answered Вечра был туман and Завтра будет туман thinking that туман is the subject of the sentence. Is that right or is there no grammatical subject and I should use the neuter of the verbs? (For the future tense I guess the masculine and neuter are the same, будет.)
This is all correct
Except for the typo in вчера

Quote Originally Posted by zorro View Post
Another question: Here I need to answer the question, У вас скоро будет контрольная? I want to answer "no". Is it У меня буду нет? There are no negative examples in the chapter.
you can either answer
нет
or you can use double negative
нет, у меня не будет

Quote Originally Posted by zorro View Post
And then some translations I'm not sure of: Are you sick or simply tired? Вы больны, но только устали?
вы больны, или только устали?
Quote Originally Posted by zorro View Post
They have been resting a long time. Они отдыхают уже давно.
correct
Quote Originally Posted by zorro View Post
How long have you been waiting for Ivan? сколько времени ты здесь ждёшь Ивана?
corect but there is no здесь in the English version, so you can remove it from the Russian sentence too