外研版七年级英语下册《Everyone will study at home》Life in the future PPT优质课件，共15页。
In twenty years’ time, maybe there won’t be any schools!
“in+一段时间”表示“一段时间之后”，常用于一般将来时。
His father will come back in an hour.
There will be a heavy rain in three days.
—How soon will you be back?
—In a month.
In twenty years’ time, maybe there won’t be any schools!
“twenty years’ ”是名词所有格。名词所有格形式多样。
①单数名词和不以-s结尾的复数名词在词尾直接加 “ ’s ”。
The short woman under the tree is Mary’s mother.
②以-s结尾的复数名词在词尾只加 “ ’ ” 。
The twins’ bedroom is big and clean.
③如果一样东西为两人或几人共同所有，则在最后一个名词的词尾加
“ ’s ” ；如果属各自所有时，则在各个名词词尾都加 “ ’s ” 。
This is Jim and Kate’s house.
Tom’s and Alice’s mothers are all teachers.
They can ask their teachers questions by Internet, telephone or email.
by prep. 表示“通过……；靠……方法/方式“。
He makes a living by working as a waiter.
What do you mean by saying that?
by表示“乘（交通工具）”时，后面直接跟表示交通方式的名词。
I will leave for Beijing by air next month.
I often go to school by bus.
Well, I’m not sure.
sure adj.“确信的；确定的”，在句中做表语。
be sure to do sth. 一定/确信会做或会发生某事
The child is sure to be a teacher.
be sure that + 从句 确信······
We are sure that she is from America.
be sure of/about sb./sth. 对某人（物）有把握
I am sure of his success.
I am not sure about English grammar.
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