#luogngochai

`21` You shouldn't(leave)... a baby alone in the house

`->` leave

`***` S `+` should/shouldn't `+` V-inf...

`22` Hoa (not / finish).... her home work last night 

`->` did not finish

`***` DHNB: last night `-` QKĐ

`(-)` S `+`  did not `+` V-inf...

`23` How often ... Nam (play)...sport?-Once a week
`->` does ... play

`***` DHNB: Once a week `-` HTĐ

`(+)` How often `+` do/does `+` S `+` V ...?

`21.` leave

`***`S `+` should (not) `+` V(nt) `+` ...

`22.` didn't finish

`-` Thì quá khứ đơn.

`@` Dấu hiệu: last night.

`***` S `+` didn't `+` V(nt) `+` ...

`23.` does Nam play

`***` How often `+` do`/`does `+` S `+` V(nt) `+` ...?

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`\mathfrak{#cuongnguyenthi}/\mathfrak{#cuongnguyenthi}`