说 一个 东西时用 There is。你能看到 一个 钟，所以我们说 There is a clock。
一样东西
There is a clock on the wall.
There is a library on Moffen Street.
There is a park behind the library.
Not "There are a clock on the wall." — say "There is a clock on the wall.". 一样东西用 is。
试一试: Look at the picture. In this classroom ___. (there are two doors / there is one door / there are one door) 答案: there is one door — 图里你能看到一扇门，一样东西用 is，所以是 there is one door。
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There is a clock.
There is a clock on the wall.
两个或更多
看图。你能看到 两个 书包，所以我们说 There are two backpacks。
There are two backpacks on the floor.
There are two restaurants on this street.
There are three stores near the bank.
Not "There is two backpacks on the floor." — say "There are two backpacks on the floor.". 两个或更多用 are。
试一试: Look at the picture. In this classroom ___. (there is one window / there are two windows / there is two windows) 答案: there are two windows — 图里你能数出两扇窗户，两个比一个多，所以是 there are two windows。
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There are two backpacks.
There are two backpacks on the floor.
一个，还是不止一个？
先数一数。一样 东西用 is，两个或更多 用 are。
There are three books on the shelf.
There is a whiteboard on the wall.
There is one bank, and there are two stores.
Not "There is three books on the shelf." — say "There are three books on the shelf.". 先数，再决定用 is 还是 are。
试一试: Look at the picture and count the desks. In this classroom ___. (there is one desk / there are four desks / there is four desks) 答案: there are four desks — 图里你能数出四张桌子，四个比一个多，所以是 there are four desks。
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There are three books.
There are three books on the shelf.
There is a whiteboard.
There is a whiteboard on the wall.
提问
要提问，就把 is 或 are 放在前面：Is there...?Are there...?
Is there a plant in the classroom? Yes, there is.
Is there a bank near here?
Are there two doors? No, there is one.
Not "There is a plant in the classroom?" — say "Is there a plant in the classroom?". 要提问，is 放在前面。
试一试: Amina: I want to know the time. ___ in this classroom?
Teacher: Yes, there is. (Is there a clock / Are there a clock / There is a clock) 答案: Is there a clock — 问一样东西时，把 is 放在最前面：Is there a clock？Are 用于两个或更多，There is a clock 不是问句。
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Is there a plant?
Is there a plant in the classroom? Yes, there is.
说某样东西不在
要说 一样 东西不在那里，就用 There isn't。（isn't = is not。）
There is a whiteboard, but there isn't a TV.
There isn't a supermarket on this street.
There is not a bus stop here. = There isn't a bus stop here.
Not "There aren't a TV in the classroom." — say "There isn't a TV in the classroom.". 一样东西用 isn't。
试一试: Look at the picture. On this wall ___. (there isn't a map / there isn't a clock / there aren't a map) 答案: there isn't a map — 图里墙上有一个钟和一块白板，但是没有地图，所以是 there isn't a map。一样东西用 isn't。
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There isn't a TV.
There is a whiteboard, but there isn't a TV.
说它们不在
要说 两个或更多 东西不在那里，就用 There aren't。（aren't = are not。）
There aren't three windows. There are two.
There aren't two libraries in Haffenville.
There are not four stores. = There aren't four stores.
Not "There isn't three windows in the classroom." — say "There aren't three windows in the classroom.". 两个或更多用 aren't。
试一试: Diego: Are there four books on the shelf?
Camila: No, look. ___ four books. (there aren't / there isn't / there are) 答案: there aren't — 图里你能数出三本书，不是四本，所以 Diego 说错了。四本书比一本多，所以是 there aren't。
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There aren't three windows.
There aren't three windows. There are two.
用起来
看看整个房间，说说有什么、没有什么。
There are four desks in the classroom.
There isn't a computer on the desks.
Is there a whiteboard? Yes, there is.
Not "Is it four desks in the classroom?" — say "Are there four desks in the classroom?". 说某个地方有什么，就用 there is / there are。
试一试: Farid: What is in the corner?
Yasmin: ___. (There are two plants / There is one plant / There are one plant) 答案: There is one plant — 你能看到角落里有一盆植物，一样东西用 is，所以是 There is one plant。