`1` are 

`2` are

`3` is

`4` is

`5` is

`6` are

`7` is

`8` are

`9` are

`10` is

`11` Is Nam's 

`12` Are there

`13` am

`14` Is

`15` is she

`16` Is this

`17` Are your `-` is

`18` Are you 

`19` Are they

`20` Is your house

`21` Isn't it

`22` Are these

`23` Is Huong's classroom

`24` aren't

`25` is

`========`

`-` Thì HTĐ: 

`(+)` S + V (s/es) | S + is/am/are + adj/N

`(-)` S + do/does + not + V | S + is/am/are + not + adj/N

`(?)` Do/Does + S + V? | Is/am/are + S + adj/N?

`-` Thì HTTD:

`(+)` S + is/am/are + V-ing

`(-)` S + is/am/are + not + V-ing

`(?)` Is/am/are + S + V-ing?

`-` Trong đó:

`@` S số nhiều `->` are

`@` S số ít `=>` is

`@` I đi với am