утвердительный: pronoun +am/is/are+noun
например: I am a doctor
отрицательный: pronoun+am/is/are+not+noun
напирмер: I'm not a doctor
вопросительный: am/is/are+pronoun+noun+?
например: are you a doctor?
ИЛИ
утвердительный: pronoun+verb+noun
например : I like ice cream
отрицательный: pronoun+do not/does not+verb+noun
напирмер : I don't like ice cream
вопросительный: do/does+pronoun +verb+noun
напирмер : Do you like ice cream?
The other day in the evening I went for a walk and saw a man in the street. He was the only person I could see. Than the man entered the house of my girl-friend, who a year ago came from the Far East. "By the way", I thought. "What is the time? Can people
do visits in such late hours?"
In a day or two I saw him again. He was in a hurry.
"Wait a minute! Can I have a word with you?" said I in a low voice.
"Tell me the truth, what do you have to do with my girl-friend?" the man seemed to be at a loss. "Dear sir, I was going to visit my friend. He is a pianist. But I'm a stranger in your town and I entered a wrong house by chance. At first sight they are alike. My friend lives next door.
And now I'd like to ask permission to go. I must be in time at the railway station to catch the next train.
If we could come on Sunday, we would come.(Conditional 2)
I would have understood Mr. Smith if he had spoken slowly.(Conditional 3)
We hadn't gone by ship unless there would had been no other way.(Conditional 3)
If you didn't give him good meals, he wouldn't be able to work hard.(Conditional 2)