Означает, что конкретный предмет, о котором говорят, известен говорящему, либо тому, кому говорят, либо всем, либо является исключительным или характерным, выделяющимся в неоднородном массиве. Используется в таком же смысле с прилагательными, наречиями, именами собственными и (спорно) с герундиями.
1.
-What happens in Valentine's Day?
-People who loves each other are spend this day together.
2.
-What will you do on Valentine's Day?
-I'll walk with my boyfriend.
3. -What will you present your boy on Valentine's Day?
-I'll present a lovely card with a heart.
I think that hero in modern life is Pavel Durov
Because he produced telegram messenger its very faster than other messengers and its safest than anyone messengers!
I'd like to describe picture number one. In the picture we can see a girl. She is standing on the stage. She's wearing a beautiful floor-lenth white dress. On her shoulders she has a capote. The girl has got a pretty face and shoulder-length dark hair. I think that she's playing the main role in the performance. I like this picture because the girl looks talented and she's got a really wonderful dress.
#1
am writing
am
are visiting
is
is shining
are
are trying
is listening
am swimming
are having
# 2
1 am
2 do
3 is
4 don't
5 doesn't
6 does
7 are
# 3
1 do you know
2 want
3 are you going
4 is listening
5 do you go
6 reads
7 does your mother finish
8 goes
9 doesn't drive
10 are doing