$#Hy$

`6-` doesn't wash

`+` every week `->` HTĐ

`(-)` S + do/ does + not + V_inf

`7-` Are they being

`+` Now `->` HTTD

` (?)` Am/ Is/ Are + S + Ving?

`8-` is studying

`+` At present `->` HTTD

`(+)` S + am/ is/ are + V_ing

`9-` doesn't often be

`+` Diễn tả sự thật hiển nhiên `->` HTĐ

`(-)` S + do/ does + not + V_inf

`10-` does Mary usually get 

`+` usually `->` HTĐ

`(?)` Do/ does + S + V_inf ... ?

6. doesn't wash

Giải thích:   every weekend  ->  HTĐ (-):   S + do/does + not + Vng.mẫu

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7. are

Giải thích:  now  ->  HTTD (+):   S + am/is/are + V_ing

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8. is studying

Giải thích:  at present  ->  HTTD (+):   S + am/is/are + V_ing

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9. isn't

Giải thích:   often   ->  HTĐ của tobe (-):   S + am/is/are + not

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10. gets

Giải thích:   usually  ->  HTĐ (+):   S +  Vng.mẫu/s,es

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