Переведите : when does the school year start?

Когда начнется учебный(школьный) год?

1.What are you ( doing) after work today? -I (am meeting) Brown for a game of tennis.
2.Father is tired. He (is going ) to bed early tonight.
3.If I ( had ) enough time right now, I (would write) my friend a letter.
4.When does Lisa ( arrive )?-She ( arrives) at six tomorrow.
5.Bella (has) a very bad habit.She is constantly (interrupting ) people.
6.When Dennis (hears) the news,he (will be) very glad.
7.How do you spell "tomorrow"?-I (will look) it up in the dictionary for you.
8.If Sam (does not finish)work in time, he (will be ) late for his bus.
9.Now I (see) what kind of person she (is).
10.Look at Sandy ! She (looks) angry.
11.As soon as he (contacts) us, we (shall give) him your message.
12.Don't forget to take your jacket. It (is getting ) colder.
13.I (am) tired of having you for a roommate! You areconstantly ( taking) my discs without asking.
14.He (is thinking) about his future right now. He ( thinks) it (will be) brilliant.
15.Now I ( know) the way of doing it.
16.Their trip (starts) tomorrow.They (leave ) at 7.
17.Where are you ( going)?-I (will be) back in a moment.
18.John (is) busy now.He (is having) his guitar lesson at the moment.
19.I (do not  like )Alan at all!He is always (giggling) when he ( sees) me.
20. Can you ( see) these papers now. Could you check them?

2 и 6 будут Past indefinite 
Остальные ,соответственно,- Present Perfect
I have built a house.
I have built a house when he came out of school
I have never built houses
I haven't built a house
Have you ever built a tower?
We built a house today
I have not yet learned words
We haven't made tutorials
They have never seen a crocodile
They haven't seen yesterday the crocodile

Так. На заметку.
Время Present Perfect обозначает действие, которое завершилось к настоящему моменту или завершено в период настоящего времени

Время Past Simple(indefinite) используется для обозначения действия, которое произошло в определенное время в и время совершения которого уже истекло