`1.` Are my neighbors singing at home?

`2.` Are those mice hiding behind the door right now?

Cấu trúc HTTD 

`(+)` `S + be` + V - ing `+ O`

`(-)` `S + be not +` V - ing `+ O`

`(?)` `Be + S +` V - ing `+ O` `?`

`color{pink}{tduong}`

`color{red}{#Atr}`

`1.` Are my neighbors singing at home?

`-` My neighbors `->` N số nhiều `->` are

`2.` Are those mice hiding behind the door right now?

`-` right now `->` DHNB thì HTTD

`-` Those mice `->` N số nhiều `->` are

`---`

`@` Thì HTTD

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

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

`(?)` Is/Am/Are + S + V-ing + O?

Trong đó

`-` He/She/It/N số ít + is

`-` You/We/They/N số nhiều + are

`-` I + am