句型21：be going to
This afternoon I'm going to buy a Qisu English book.
句型22：be different from
I think this is different from Chinese names.
Welcome back to school!
句型24：have fun doing
We're going to have fun learning and speaking English this term.
句型25：... because ... / ...，so ...
I don't know all your names because this is our first lesson.
句型26：Why don't you ... / Why not ...
Why don't you come to school a little earlier?
Let's make it half past nine.
句型28：have nothing to do
They have nothing to do every day.
句型29：be sure/ be sure of/ about sth. / be sure to do sb.
I think so, but I'm not sure.
I was not sure of / about the way，so I asked someone.
句型30：between ... and ...
There is a shop between the hospital and the school.
句型31：keep sb. / sth. +adj./ V-ing/ 介词补语/ adv.
You must keep your classroom clean.
Sorry to have kept you waiting.
Can you keep him in the room ?
Keep them here.
He finds it very hard to travel around the big city .
句型33：... not ... anymore/ longer
The old man doesn't travel any more.
He isn't a thief any longer.
句型34：What's the weather like...?
What's the weather like in spring in your hometown?
句型35：There is no time to do/ have no time to do
There was no time to think.
I have no time to go home for lunch.
句型36：Help oneself to...
Help yourself to some fish.
句型37：used to do
I used to read this kind of story books.
句型38：borrow ... from
I borrowed a Qisu English book from him.
句型39：lend sb. sth. / lend sth. to sb.
He lent me a story book / He lent a story book to me.
句型40：have been to
Have you ever been to Hawaii?