It is a fair question, but the answer to it is not easy.The hardest part for me in the English language are prepositions. That's really what defies analogy with the native Russian. Where we expected an excuse, it is no reason. For example, to marry smb why in English there is no preposition. We all just. to marry someone. The preposition like should be "on", but nothing like this.Second, no less difficult problem of the English language is the polysemy of words. When you open the dictionary to find the translation of a word, just tired to read the list of meanings of the word. For example, the word cast. Still can not fully understand how to use it. How, then, to learn words and expand your vocabulary? The solution is to remember in the context of a work. That is, again, one has to read and listen to the English language
2. May
3.must
4. May
5. May
6. Must
7.
Must
8.
Must
9.must
10may
-we could help you
We will be able to help you
I could do this work myself
I will be able to do this work myself
She could translate the article into Russian
She will be able to translate the article into Russian
He could go to the library with you
He will be able to go to the library with you
They could read English books
They will be able to read English books
I had to do my exercises
I will have to do my exercises
He had to be at the institute at nine o'clock
He will have to be at the institute at nine o'clock
You had to learn the story by heart
You will have to learn the story by heart
We had to walk fast to get to the station in time
We will have to walk fast to get to the station in time
She had to do it at once
She will have to do it at once
Третье извини не поняла задание