Giúp mik vs ah cần gấp lắm ah 

`1`The dentist told me to brush my teeth three times a day.

`=>` S + told + O + to_V: bảo ai làm gì

`=>` QKĐ `(+)` S `+` Ved/2

`2`  I am trying to keep my health by doing exercise every day.

`=>` HTTD `(+)`  S + am/is/are + V-ing...

`=>`  try + to V: cố gắng làm gì

`=>` By `+` V-ing

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`49,` The dentist told me to brush my teeth three times a day.

- Câu tường thuật dạng mệnh lệnh : S + asked/told + O + (not) + to V

- Thì QKĐ : S + Ved/V2 

- tell - told - told (v) : kể , bảo

 `50,` I am trying to keep my health by doing exercise every day.

- try + to V : cố làm việc gì đó

- Thì HTTD : S + is/am/are + V-ing + O 

- "I" là chủ ngữ số ít nên chia "am"

 - sau tính từ sở hữu (my, your, our, his, her, their, its) cần N 

- by + V-ing