Thare are many persons.
They are on the concert.
There are flowers on the picture
There is senger.
There are musitions.
People don`t start the concert.
Maybe it is school concert
I like concerts.
There are two photogrophers,
They aren`t happy!
1 We will save a lot of money , if we travel by car.
2 I will visit you as soon as I feel better.
3 If he doesn't come, we will have a problem.
4 He will work at a foreign company after he graduates.
She is writing a letter Pr Cont.
She will write a letter Future Simple
She wrote a letter Past Simple
это необязательно, думаю, времен в английском много, но на всякий случай ещё 3:
She has written a letter Pr Perfect
She had written a letter Past Perfect
She will be writing a letter Future Cont
A-ставится предмету о котором говорим о предмете 1 раз
ан-тоже самое только со словами которые начинаются на глассную
the-конкретный предмет