I thought you (have) a bath at that time.
I thought you (watch) TV all morning.
He was planning how he (spin) cocktail on his vacation.
I (do) my homework at six o’clock tomorrow.
I (write) a composition the whole evening.
What you (do) at eight o’clock tomorrow?
He (do) his work from three till six.
We knew she (pack) next Friday.
They knew he (write) the article next Monday.
I thought we (work) all day.
He said he (read) at that time.

All countries have conventional but important behaviour rules that could be explained by inhabitants only. So, you've come to Russia but you haven't know about these rules yet. I'll help you learn primary of them. 
Firstly,russuians usually cede pleces to aged people in the bus. We take care about our elderly. This rule should be known to you,for sure. 
Secondly,russians usualy take off their footwear before entering the house. Perhaps,it could seems rather strange. But this is russian behaviour rule.
Thirdly, we usualy say "enjoy your meals" to each other before dinner,supper. It's not typical for your country,isn't it? Also,when russians have a meet they can kiss each other. We don't open gifts out of hand,which was presented to us. There are many another rules. But, we have to remember foreigners don't aware about all our rules and as long as you staying friendly and polite don't worry about your a little bit strange behaviour.  
Вот исправленный вариант.

ответ:Утвердительные :

1.I must go to school.(я должен идти в школу)

2. I must do gardening( я должен заниматься садоводством )

3. I must take care of my animals . (Я должен заботиться о животных)

Отрицательные :

1. I mustn't have cats .(я не должен иметь кошек)

2. He mustn't go for a walk.he is ill (он не должен идти на прогулку . Он болеет)

3.my sister mustn't drive. She ıs only ten years old ! (Моя сестра не может водить . Ей только 10 лет!)

После модального глагола must ,частица to не ставится!

Объяснение:

∫∅х